Special liquid leaching method in metal phosphating process

The invention relates to a special liquid leaching method in a metal phosphating process. A workpiece baffle is placed in a case body, a phosphated workpiece is placed on the workpiece baffle, a pneumatic lifting device moves downward to lower the workpiece baffle, phosphating wastewater flows into a sewage outlet, a heating device is started, and the phosphating wastewater flows out of a sewage channel. A special liquid leaching device can solve the problems that a dry dead corner exists caused by accumulation of workpieces after the phosphating process, and phosphating liquid cannot be leached and dried well, the heating device arranged at the bottom of the workpiece baffle can speed up drying of the workpiece, the purpose of waste liquid on the workpiece flowing into the sewage outlet through the pneumatic lifting device is realized, and the waste liquid on the workpiece is collected through the sewage outlet and discharged from the sewage channel; and through design of a supportingrod and a supporting foo