Pressure balance type freezer box cover

The utility model relates to the technical field of refrigeration equipment, and provides a pressure balance type freezer box cover which comprises an outer cover plate and a cover lining, and a ventilation assembly is arranged between the outer cover plate and the cover lining. The cover lining is provided with a receding hole communicating with the ventilation assembly. The ventilation assembly comprises a ventilation pipe; one end of the ventilation pipe is connected with the ventilation box, and the other end is connected with the joint pipe; an air inlet is formed in the side wall of the box cover, and the connector pipe is connected with the air inlet. Therefore, the ventilation assembly is arranged between the outer cover plate and the cover lining; after the box cover of the freezer is closed, the internal air pressure is reduced along with the reduction of the temperature in the freezer. And in the process of reducing the air pressure, external air is sucked in from the air inlet hole and enters the