Sheet metal grinding and polishing equipment comprises an equipment shell, a sand mill and a conveying device, and is characterized in that the equipment further comprises a magnetizing device, a demagnetizing device, a spraying device, an air blowing device, a liquid collecting device and a purifying and filtering device; the magnetizing device and the demagnetizing device are used for magnetizing a workpiece during grinding, the effect that the to-be-ground workpiece can be well attracted to a permanent magnet during grinding can be well ensured, the grinding stability is high; the sprayingdevice and the air blowing device are adopted, sandy dust particles on the surface of the ground workpiece are cleaned through spraying and purging in sequence, the spraying device can absorb dust well, and safety and environment protection are achieved; and automatic production is achieved, the final consistency and uniformity of products can be ensured through the mechanical technical process, deformation and uneven grinding caused by manual operation are avoided, precision control is facilitated, and the precision can be controlled within 0.01 mm, and the production effect is good.