The invention relates to a training device, in particular to a breaststroke training device. The technical aim is to provide the breaststroke training device which can be convenient to use and can improve the training efficiency. According to the technical scheme, the breaststroke training device comprises a supporting base, a lifting device, a Y-shaped rack, a first support, a first supporting pad, a second support, a first slide sleeve, a first slide rod, a second supporting pad and the like; the lifting device is connected to the top of the supporting base, the Y-shaped rack is connected tothe top of the lifting device, and the first support is connected to the left side face of the Y-shaped rack; the first supporting pad is hinged to the top of the first support, and the second support is connected to the left side face of the first support. According to the breaststroke training device, a pedal is rightwards stepped on by foot, in this way, the second supporting pad can be upwards moved, so that the head of a beginner is upwards lifted out of the water surface, and accordingly the situation can be avoided that the beginner inhales water during breaststroke training; by releasing the pedal, the head of the beginner can be downwards moved into water of a water pond, in this way, repetition continues, breaststroke training can be conducted, and accordingly the training efficiency can be improved.