The invention relates to a training cylinder, in particular to a swimming training cylinder. The swimming training cylinder is expected to be relatively safe and convenient for swimming beginners to perform movement exercises. Technical scheme: a swimming training cylinder comprises a training cylinder, an inlet pipe, an outlet pipe, a lifting hollow plug, a valve, a first spring and the like; Anupper part of that right wall of the train cylinder is connected with an inlet water pipe, an upper part of the right wall of the training cylinder is provided with an inlet hole, the inlet hole is communicated with the inlet water pipe, a first through hole is provided on the upper part of the right wall of the training cylinder, the first through hole is communicated with the inlet hole, a lifting hollow plug is plugged in the first through hole, the lifting hollow plug is controlled by electric power, and an outlet water pipe is connected with the left part of the lower wall of the trainingcylinder. As that train cylinder is arranged, the volume of the train cylinder is small, and a proper amount of water can be introduced into the training cylinder for swim training, so that the training cylinder is relatively safe. As that first swivel lever and the support base are provided, the first swivel lever can be rotated clockwise to raise the first swivel lever when a person needs to perform relevant practice such as breaststroke or backstroke.