In a statement, Hazim Qasim urged all countries, especially Arab states, to boycott the conference, whose main aim, he said, is to destroy Palestine.
He also called on the Arab League to ask the member states to refrain from attending the US-sponsored gathering.
The United States announced earlier this month that it would co-host the June 25-26 meeting in Bahrain’s capital city of Manama, purportedly to encourage investment in the occupied West Bank and the besieged Gaza Strip.
However, Palestinian officials say the real aim is to pave the ground for the administration of US President Donald Trump to unveil its much-hyped “deal of the century”, which they have already rejected as a non-starter.
Hamas has condemned attempts by certain Arab countries to normalize ties with Israel as well as the Bahrain conference in support of Trump's controversial proposal.