Underwater treadmill

The utility model discloses an underwater treadmill which comprises a treadmill base and a treadmill shell arranged on the treadmill base in a covering mode, the treadmill base comprises a treadmill plate, a driven roller assembly is arranged at the rear end of the treadmill plate, an installation base is connected to the front end of the treadmill plate, and a driving roller assembly is arranged on the installation base. A running belt which surrounds the running table plate and is driven by the driving roller assembly to rotate is arranged between the driving roller assembly and the driven roller assembly, a waterproof motor assembly is arranged on the mounting base, a first synchronizing wheel is arranged on a rotating shaft of the waterproof motor assembly, and a second synchronizing wheel is arranged at one end of the driving roller assembly; a synchronous belt is arranged between the first synchronous wheel and the second synchronous wheel, the underwater treadmill is placed in water for use, the pressu