Anti-freezing assembly and water heater

The invention discloses an anti-freezing assembly and a water heater. The anti-freezing assembly comprises a pipeline, a first sliding block and a first elastic piece. The pipeline comprises a pipeline body which comprises a first connector. The first sliding block and the first elastic piece are both arranged in the pipeline body, and the first elastic piece is used for providing elastic force away from the first connector for the first sliding block; when the water pressure in the pipeline body is larger than a first preset value, the first sliding block moves in the water flow direction, the first elastic piece is compressed and deformed in the displacement direction of the first sliding block, and the first sliding block moves to the first connector and seals the first connector. Meanwhile, when water in the pipeline freezes, the pressure in the pipeline is increased, the first elastic piece applies force away from the first connector to the first sliding block, the first connector is opened, the water fl