The invention relates to a full-jacket heating pump. Clamping cavities are respectively arranged on a water inlet end of the pump, a water outlet end of the pump, a pump shell, a pump cover and a sealing gland part. Exhaustive overall heat preservation is carried out on all parts of a pump body, contacted with conveying medium or remained with the conveying medium through liquid state thermal medium or superheated steam, so that the pump body cannot be damaged by medium solidification or crystallization when the pump is restarted when the pump is in an operation state or after the pump is shut down, the service life of the pump body is improved, and the continuity in operation of the pump body is ensured.