Low-temperature frost resistance testing device

The utility model provides a low-temperature frost resistance testing device which comprises a low-temperature testing box, a pretreatment box is installed on the right side of the low-temperature testing box, three plate dismounting and mounting openings are formed in the front face of the pretreatment box, an impurity filtering frame is arranged in the middle of each plate dismounting and mounting opening, and a filtering hole plate is installed between the two impurity filtering frames on the upper portion. The impurity filtering frames are arranged at the bottom of the pretreatment box, a plurality of filtering hole plates are arranged on the impurity filtering frames, a plurality of hexagonal filtering holes are respectively formed in the upper surface of each filtering hole plate in a penetrating manner, and a microporous filtering membrane is arranged in the middle of the impurity filtering frame at the bottom of the pretreatment box. Impurities mixed in the resin can be finely filtered before the low-