Fireproof check valve

The utility model provides a fireproof check valve which comprises a valve body, a valve seat, a valve plate and an opening stopping mechanism, the valve seat is fixed in the valve body, and an exhaust port is formed in the valve seat; the valve plate is arranged on the valve body in an openable and closable manner and can cover the exhaust port; the opening stopping mechanism is used for limitingthe valve plate at the valve closing position; wherein the opening stopping mechanism comprises a mounting seat, an opening stopping connecting rod, a fuse link and a return spring, and the mountingseat is detachably arranged on the valve body and located below the side, away from the valve seat, of the valve plate; a first rotating shaft is arranged on the mounting base, the return spring is arranged on the first rotating shaft in a sleeving mode, and the rotating end of the opening stopping connecting rod is hinged to the first rotating shaft and tightly presses the return spring; one endof the fuse link is fixed o