The utility model relates to a multifunctional angle cock closing preventing device for trains, comprising a valve body, a valve core, an alarm and an equalizing pressure reducing valve; The warp directional end of the valve body is provided with an air inlet, an air outlet and an air exhaust pipes which are vertically in the shapes of T and are positioned in the same plane. The warp direction of the valve core in the utility model is provided with an air inlet pipe, an air outlet pipe and a guiding hole which is communicated with a shaft. The valve core and the guiding hole are vertically form a T shape, and the valve core is communicated with an interconnecting hole. The air exhaust pipe is connected with the alarm, and the alarm is connected with the front end of a balanced reducing valve. The middle part of the air outlet pipe is provided with a refluxing pipe which is connected with the back end of the balanced reducing valve. The utility model has the advantages of simple structure and easy improvement. When normally closing the device, the utility model can alarm and carry out emergency brake in time, which ensures the safe operation of the trains.