Fireproof smoke exhaust valve capable of being opened and closed safely

The utility model relates to the technical field of smoke exhaust valves, in particular to a fireproof smoke exhaust valve capable of being opened and closed safely. According to the technical scheme, the device comprises a device body, a protection box and a rotating disc, an air inlet plate is installed at one end of the device body, an air outlet plate is installed at the other end of the device body, the protection box is installed at the top of the device body, sliding rails are installed at the two ends in the protection box, and sliding blocks are slidably installed in the sliding rails. The air inlet plate is installed at one end of the device body, when the device is used, internal smoke exhaust can be conducted through the air inlet plate and the air outlet plate, meanwhile, when the device is used, the cover plate can be pushed to drive the sliding block to slide in the sliding rail, and at the moment, the cover plate and the protection box can be mutually closed to protect a device switch; and mea