Improved liquefied petroleum gas cylinder filling simulator

The utility model relates to the technical field of filling simulation, in particular to an improved liquefied petroleum gas cylinder filling simulator, which comprises a box body and a transverse plate, the transverse plate is fixedly connected inside the box body, the upper surface of the transverse plate is fixedly connected with a fixing ring, the fixing ring is fixedly connected with the outer wall of a pipeline, a one-way mechanism is arranged inside the pipeline, and the one-way mechanism is fixedly connected with the outer wall of the pipeline. A ventilation mechanism is arranged in the box body, and a stop valve is arranged in the pipeline. Through cooperation of a supporting plate, a spring, a protruding block, a supporting rod and a rubber ring, liquefied petroleum gas filled in an external inflation tank drives the protruding block to move downwards, the protruding block compresses the spring, the liquefied petroleum gas enters a pipeline along the two sides of the protruding block, and when the f