Farmland irrigation system for water conservancy project

The utility model relates to the field of water conservancy projects, and particularly discloses a water conservancy project farmland irrigation system which comprises a water storage tank and a water inlet pipe, a filter screen is detachably arranged at the end, close to the water storage tank, of the water inlet pipe, a fixing block is fixedly connected to the outer wall of an opening of the water inlet pipe, and a mounting block is fixedly connected to the outer wall of the filter screen; the mounting block is provided with a mounting groove, the mounting block is elastically provided with two insertion blocks in the mounting groove, the fixing block is provided with insertion holes for insertion of the two insertion blocks, clamping pieces are arranged between the fixing block and the insertion blocks, and the mounting block is provided with limiting pieces for limiting the movement direction of the insertion blocks. The device has the effect that the filter screen is convenient to disassemble, so that th