Earthworm overwintering device suitable for Hebei region

The utility model relates to the technical field of earthworm overwintering devices, in particular to an earthworm overwintering device suitable for the Hebei region, which improves the heat preservation effect in a box body, reduces the death condition of earthworms due to a low-temperature environment, improves the overwintering survival rate of the earthworms and optimizes the growth environment of the earthworms. Comprising a box body and a tank body, and the tank body is arranged in the box body; the ventilation device is arranged on the upper portion of the box body, an opening is formed in the left end of the box body, the groove body extends into the box body through the opening, the right end of the cover plate is connected with the left end of the groove body, the cover plate covers the opening of the box body, the net bag is installed at the bottom of the inner side wall of the groove body, and the net bag is installed at the bottom of the inner side wall of the groove body. The multiple sets of gu