The utility model belongs to the technical field of an oil production equipment technique and specifically relates to an oil recovery water injection well filter of making a slip of tongue. Including barrel and upper and lower head, wherein upper and lower head is equipped with outlet pipe and blow off pipe respectively, is equipped with the filter in simplified, and both sides are equipped with intake pipe and inlet tube respectively about the barrel wall that the filter corresponds, filter cavity, the inside cavity installation magnetic core array of filter, the outer surface mounting of magnetic core array has the magnetic conduction hair. Compared with the prior art, the utility model, simple structure, convenient operation, the filter effect is good and easy maintenance, has improved the quality of water injection greatly. The utility model discloses set up magnetic core array and magnetic conduction hair at shells inner wall, made rivers and magnetic conduction hair fully contact to it rates to have improved impurity adsorption, through adopting high -magnetic -permeability soft magnet nickel alloy 1J116 material, make the adsorption efficiency of magnetic conduction hair further strengthen.