Poroshenko was born in Bolhrad, Ukrainian SSR, Soviet Union, in 1965 (age 53). In 1989, he graduated with a degree in economics from the international relations and law department at the Kyiv State University. In 2002, he defended his thesis “Legal regulation of the state corporate rights management in Ukraine.”
In 1990-1991 he was deputy director of the “Republic” Union of Small Businesses and Entrepreneurs, and in 1991-1993 was the CEO “Exchange House Ukraine.” In 1993, Poroshenko, together with his father and associates, created the UkrPromInvest Ukrainian Industry and Investment Company, engaged in confectionary and automotive industries. In 1993-1998 Poroshenko was General Director of Ukrprominvest, President of the Leninska Kuznia Plant, shipbuilding and armament company, Chairman of the Board of Mriya Bank, Chairman of the Supervisory Board of Vinnytsia Confectionery Factory. Between 1996 and 1998, UkrPromInvest acquired control over several state-owned confectionery enterprises which were combined into the Roshen group in 1996. Thus the largest confectionery manufacturing operation in Ukraine was created.
Poroshenko first won a seat in the Verkhovna Rada in 1998. He was initially a member of the United Social Democratic Party of Ukraine (SDPU), the party led by Viktor Medvedchuk. Two years later he left SDPU and created his own Party of Ukraine’s Solidarity. In 2001, Petro Poroshenko was instrumental in creating the Party of Regions, which was later headed by fled ex-president Viktor Yanukovych; the Party of Ukraine's Solidarity merged into the Party of Regions, so Poroshenko launched a new party with a similar name Solidarity party.
In 2002, Poroshenko became a member of ex-president’s Yushchenko’s Our Ukraine faction. He joined the Presidium of the People’s Union Our Ukraine Party. In the March 2006 parliamentary election, Poroshenko was re-elected to the Ukrainian parliament with the support of Our Ukraine. In the Verkhovna Rada of the fourth convocation, he headed the budget committee. After the 2006 elections, he headed the finance and banking committee. Yushchenko nominated Poroshenko for Foreign Minister in 2009.
One of the pages of Poroshenko’s biography is associated with Ukraine’s National Security and Defense Council (NSDC). From February to September 2005, he was the NSDC secretary. He lost his post as a result of a scandal involving the accusation of corruption of the closest associates of the president and lobbying for personal interests.
In 2012, Yanukovych appointed Poroshenko economic development and trade minister of Ukraine. Since December 2012, he has been MP of the 7th convocation.
In May 2014, Poroshenko was elected the fifth president of independent Ukraine.
In 2015, Ukrainian oligarch Dmytro Firtash at a court session about his extradition to the United States stated that at the Ukrainian presidential election he financially supported Poroshenko.
According to his 2018 income bill, Poroshenko's revenues increased by more than 95 times compared to 2017 and amounted to 1.6 billion USD. Poroshenko set up an offshore company in the British Virgin Islands during the peak of the war in Donbas.
Poroshenko and his close associates have been implicated in numerous corruption scandals.