The embodiment of the invention provides a train speed control method and device and a storage medium. The method comprises the steps of obtaining pressure wave data collected by a pressure wave collector, wherein the pressure wave collector is arranged on the outer surface of a first train; according to the pressure wave data, determining the current speed of a second train about to intersect with the first train; according to the current speed of the second train and the current speed of the first train, estimating the car body pressure between the first train and the second train when the first train and the second train intersect with each other; when the pressure of the car body is larger than the preset safety pressure, controlling the first train to decelerate before the first trainand the second train intersect with each other. Due to pressure waves generated by running trains in a tunnel, whether or not a train comes in the opposite direction can be accurately judged, due tothe pressure wave, the speed of the train coming in the opposite direction can also be accurately determined, whether or not the train needs to be decelerated can be accurately judged, and the phenomenon that deceleration is not performed in time due to misjudgment is avoided.