The invention discloses a screening mechanism with a dual screening function. The screening mechanism comprises a mechanism body, a first supporting base is arranged on the left side of the mechanismbody, a water tank is arranged on the first supporting base, a water pump is connected to the water tank through a water pipe and connected to the interior of the mechanism body through a water pipe,and sprinkler heads are arranged at the bottom end of the water pipe; a feeding port is installed on the right side of the mechanism body, and one end of the feeding port penetrates through the uppersurface of the mechanism body and extends into the mechanism body; a second supporting base is fixedly installed on the right side of the mechanism body, a supporting rod is fixedly installed on the upper surface of the second supporting base, and a conveyer belt is fixedly connected to the top end of the supporting rod; and a first screen mesh is installed in the mechanism body, and a second screen mesh is arranged at the lower end of the first screen mesh in parallel. According to the screening mechanism with the dual screening function, the first screen mesh, the second screen mesh, springs, bouncing balls, damping springs and the like are arranged, and therefore the problems that in the prior art, a screening mechanism is single in structure and low in working efficiency, materials cannot uniformly fall to the screen meshes, and the screening effect is bad are solved.