The mobile box-type liquid sandblasting machine mixes abrasive and water through the abrasive liquid pump and transports it to the spray gun, uses compressed air to accelerate the abrasive liquid, and sprays it onto the surface of the workpiece for cleaning and processing. Its working principle is to use the pressure difference generated by the air pump to transport the abrasive liquid in the liquid tank to the spray gun to achieve an atomization effect, thereby performing a decorative or protective role.