The invention provides a sand washing and separating device. The sand washing and separating device comprises a motor, a speed reduction machine, a coupler, a barrel body and a main shaft arranged in the middle inside the barrel body; the motor is connected with the speed reduction machine, the speed reduction machine is connected with the coupler, and the coupler is connected with the main shaft. According to the innovation points, the barrel body is internally provided with a sieving guiding device, and the sieving guiding device is installed on the end head part of the barrel body; two separation cavities are partitioned in the middle of the barrel body end and on the end tail portion; the sieving guiding device comprises a guiding barrel and a sieving device, the guiding barrel is installed over the sieving device and is not in contact with the sieving device; and the guiding barrel comprises a vertical barrel with the two ends being not sealed, the unsealed end, close to the end head part of the barrel body, of the vertical barrel is provided with a sand circulation spiral system.