The invention discloses a sand mixer with a screening function. The sand mixer with the screening function comprises a machine body. A sand mixing tank is fixedly connected to the internal bottom wallof the machine body. A clamping seat is arranged on one side of the machine body. A motor is fixedly connected to the upper surface of the clamping seat. A rotary rod is fixedly connected to the output end of the motor. The end, far away from the motor, of the rotary rod penetrates through the outer surface of the machine body and the outer surface of the sand mixing tank to extend into the sandmixing tank. The outer surface of the rotary rod is sleeved with a first gear. The outer surface of the first gear is sleeved with a rack. A driven rod is arranged in the machine body. The two ends ofthe driven rod penetrate through the inner sidewall of the machine body and extends to the outside of the machine body., The outer surface of the driven rod is sleeved with a screening drum. The outer surface of the screening drum is provided with a feed port and material leaking holes. One end of the driven rod is fixedly connected with a second gear. The sand mixer with the screening function has the advantages of being simple in structure, high in working efficiency and capable of screening materials.