Protection device capable of preventing deformation of sealing position for tap water meter

The invention discloses a protection device capable of preventing deformation of a sealing position for a tap water meter in the technical field of water meters. The protection device comprises a water meter body, a connecting pipe and a pipeline, a sealing ring is fixedly mounted at one end, close to the water meter body, of the pipeline, the outer wall of the sealing ring is attached to the inner wall of the connecting pipe, a protection device body is fixedly mounted on the inner wall of the connecting pipe, and the sealing ring is located in an inner cavity of the protection device body. In the device, the sealing ring is shielded through an annular plate and an annular moving block of the protection device body, water pressure in the interior of the connecting pipe cannot directly act on the sealing ring, the situation that the sealing ring deforms due to increase of the water pressure in the interior of the connecting pipe is avoided, and therefore normal work of the sealing ring is guaranteed; and the