The invention relates to an early warning system of a fuel gas pressure adjusting device. The early warning system comprises the fuel gas pressure adjusting device, a pressure sensor, a trigger alarming system, a linkage module, a pipe disconnection system, a manual system and a remote alarming system; the pressure sensor is arranged behind the fuel gas pressure adjusting device, the trigger alarming system is arranged behind the pressure sensor, the linkage module is arranged behind the trigger alarming system, the pipe disconnection system is arranged behind the linkage module, the manual system is arranged behind the pipe disconnection system, and the remote alarming system is arranged behind the linkage module fixedly. According to the early warning system of the fuel gas pressure adjusting device, the pipe disconnection system is arranged and can be conveniently matched with the manual system to achieve automatic closing and manual opening, and safety and controllability are increased; and the remote alarming system provided with a monitoring background and an alarming center is arranged, the remote warning effect on the early warning system is conveniently achieved, the structure is simple, and implementation is easy.