The vote will take place on Monday, the same day as a Supreme Court deadline for the government to reopen corruption cases against political figures.
The deadline was set after the court quashed an amnesty for politicians, including President Asif Ali Zardari.
Correspondents say that Prime Minister Gilani is likely to secure Monday’s vote of confidence and obtaining parliament’s seal of approval is likely to strengthen his hand.
The stand-off with the military escalated earlier this week when the military publicly rebuked Mr Gilani on Wednesday, warning of “serious ramifications with potentially grievous consequences” after he criticised military leaders in a media interview.
Mr Gilani also sacked his defence secretary, who is seen as having close ties to the military, in a move likely to heighten frictions with military leaders.
At the heart of the rift is an anonymous memo which sought US help to avert a possible military coup in Pakistan following the killing by US forces of al-Qaeda leader Osama Bin Laden in May.
The government is also on a collision course with the judiciary, which wants to reopen old corruption cases in which the president argues he is innocent.