The utility model discloses a latent oily diaphragm pump system of double -diaphragm, higher level's diaphragm pump and subordinate's diaphragm pump including the same submersible motor of sharing, submersible motor drives higher level's piston and the piston syntropy reciprocating motion of subordinate, makes higher level's diaphragm and subordinate's diaphragm up -and -down motion to produce malleation or negative pressure in the airtight cavity of airtight cavity of higher level and subordinate, through the switching effect of positive negative pressure in the airtight cavity, during subordinate's diaphragm pump sucks the well liquid of oil well packer below the airtight cavity of subordinate, then it is aerial to the oil sleeve annulus of oil well packer top to discharge, higher level's diaphragm pump is during the well liquid in empty inhales the airtight cavity of higher level with oil sleeve annulus, then discharges to produce oil pipe in to lift well liquid to ground through production oil pipe. The utility model discloses can increase substantially its lift parameter to further improve its whole efficiency, thereby make the oily diaphragm pump of diving to be applied to the stripper well.