The invention discloses a strip screening mechanism for a urine analyzer. The strip screening mechanism comprises a strip screening rolling shaft, a stirring piece, a stirring motor, strip dischargingdetection sensors, a drying frame, a test strip storage bin, a test strip push plate, a limiting body, a support piece, side plates, a strip screening roller motor, a test strip reversing roller, a reversing roller motor and a test strip falling plate; the strip discharging detection sensors are arranged above the test strip falling plate, a strip screening groove is formed in the strip screeningrolling shaft in the direction of a rolling shaft, and an inclined angle is formed at the portion, the height of which is larger than the thickness of test strips, of the rear side of the strip screening groove; a strip arranging groove is further formed in the strip screening rolling shaft, the limiting body is fixedly provided with the stirring piece and the stirring motor, the stirring piece is fixed to an extension shaft of the stirring motor, and an opening groove providing convenience for the rotation of the stirring piece is formed in the portion, corresponding to the stirring piece, of the limiting body. By means of the strip screening mechanism, the speed of screening the test strips is increased, the damage, misjudgment and sticking problems in the process of screening the teststrips are solved, and the screening efficiency is effectively improved.