Wellhead filtering device of water injection well

The utility model discloses a water injection well mouth filtering device which comprises a main water supply pipe communicated with a water source and a main water outlet pipe communicated with the water inlet end of a water injection pump, and a first pipeline filter and a second pipeline filter are connected between the main water supply pipe and the main water outlet pipe in parallel. According to the utility model, the first pipeline filter and the second pipeline filter which are connected in parallel between the main water supply pipe and the main water outlet pipe are utilized, one of the first pipeline filter and the second pipeline filter can be used for filtering water by opening the corresponding branch water supply valve and the branch water outlet valve, and the other one is used as a standby; when one pipeline filter needs to be cleaned or replaced, only the on-off states of the branch water supply valve and the branch water outlet valve need to be switched, water injection work does not need t