Rotary valve with shaft end leakage prevention device

The utility model discloses a rotary valve with a shaft end leakproof device, which belongs to the technical field of rotary valves and comprises a shell, a rotor is arranged in the shell, a right side cover is mounted on the right side of the shell, and the right end of the rotor is a power input end. A circular counter bore is coaxially formed in the power input end of the rotor, and a first annular magnet is arranged on the inner wall of the circular counter bore. A round protrusion is arranged at the position, corresponding to the round counter bore, of the right side cover, the round protrusion is coaxially arranged in the round counter bore in a sleeved mode, and a gap is formed between the peripheral face of the round protrusion and the inner wall face of the round counter bore. The circular bulge is provided with a hollow inner cavity; the rotary valve further comprises a power shaft, the end of the power shaft extends into the hollow inner cavity of the circular protrusion in a suspended mode, a seco