Tire pressure alarm system equipment with waterproof function and capability of automatically replacing trailer

The utility model relates to the field of automobile industry, in particular to tire pressure alarm system equipment with a waterproof function and capable of automatically replacing a trailer, which comprises a monitoring mechanism, the monitoring mechanism comprises a valve core, the monitoring mechanism is fixedly provided with an alarm mechanism, and the alarm mechanism comprises a signal receiving mechanism. And a display alarm mechanism is fixedly arranged in front of the signal receiving mechanism. According to the utility model, a valve core on an original trailer tire is detached, the valve core provided with the monitoring mechanism is installed, then the wheels are aerated until proper air pressure is reached, the equipped alarm device is placed in a vehicle and at a position easy to observe by a main driver, and the barometer monitors the air pressure in the wheels in real time in the driving process, so that the safety of the vehicle is ensured. When the air pressure of the wheels is changed and