Wellhead filtering device of water injection well

The utility model discloses a wellhead filtering device of a water injection well, and relates to the technical field of oilfield exploitation equipment. The device comprises a vertical injection pipe, a transition pipe and a water outlet pipe, one end of the injection pipe is connected with water injection equipment, the other end of the injection pipe is connected with a primary filtering system, one end of the transition pipe is communicated with a secondary filtering system, the other end of the transition pipe is connected with the primary filtering system, and the primary filtering system is communicated with a secondary filtering system. And one end of the water outlet pipe is connected with the secondary filtering system. Through the primary filtering system and the secondary filtering system, the secondary filtering function is achieved, the filtering effect is good, the situation that the stratum is blocked and polluted due to the fact that the water quality of injected water cannot meet the require