The invention discloses a thermochromic treatment device for protective clothing. The device comprises a treatment pond, a liquid inlet pump is arranged on the treatment pond and is arranged on the outer side wall of the end of the treatment pond, and a liquid outlet pump is arranged on the treatment pond and disposed on the outer side wall of the bottom of the treatment pond. A guide pipe is arranged at the end of the treatment pond, a lifting adjusting pipe is sleeved with the guide pipe, a magnetic attracting block is arranged at the lower end of the lifting adjusting pipe, a filter tank is arranged at the end of the treatment pond, a liquid inlet pipe is disposed at the end of the filter tank, a liquid inlet plate is arranged at the end of the filter tank, and the liquid inlet pipe is arranged on the liquid inlet plate. By means of the treatment device, the protective clothing is conveniently installed at the lower end of the lifting adjusting pipe, and thermochromic treatment of the protective clothing is facilitated.