A heating pump, comprising: a housing, wherein a heating cavity is provided in the housing, and the housing is provided with a water inlet which is communicated with the heating cavity; an impeller, wherein the impeller is provided in the heating cavity, the impeller comprises an annular cover plate, a first end of the cover plate defines a water inlet port which is correspondingly communicated with the water inlet in a surrounding manner, and a second end of the cover plate extends in a direction away from the water inlet along an axial direction of the impeller and expands outwards; wherein, an annular matching surface is provided in the heating cavity; an outer side of the cover plate is wrapped with the matching surface, and there is a gap between the matching surface and the cover plate; the matching surface has a third end and a fourth end which are arranged in an axial direction of the impeller; the fourth end is arranged corresponding to the second end; and a diameter of the fourth end is greater than or equal to a diameter of the second end; wherein the cover plate comprises a straight cylindrical section and an arc expansion section which is connected with the straight cylindrical section, an end of the straight cylindrical section which is away from the arc expansion section forms the first end of the cover plate, and an end of the arc expansion section which is away from the straight cylindrical section forms the second end of the cover plate; the matching surface comprises a straight line section and an enlarging section which is connected with the straight line section, an end of the straight line section which is away from the enlarging section forms the third end of the matching surface, and an end of the enlarging section which is away from the straight line section forms the fourth end of the matching surface; the straight line section surrounds the straight cylindrical section, and the enlarging section surrounds the arc expansion section; wherein a length of the straight line section is greater than a length of the straight cylindrical section; characterized in that an end of the straight line section which is away from the enlarging section is connected with an annular bevel; and the annular bevel extends obliquely in a direction close to the straight cylindrical section along a direction from outside to inside, and in that the gap between the matching surface and the cover plate is disposed uniformly. a housing, wherein a heating cavity is provided in the housing, and the housing is provided with a water inlet which is communicated with the heating cavity; an impeller, wherein the impeller is provided in the heating cavity, the impeller comprises an annular cover plate, a first end of the cover plate defines a water inlet port which is correspondingly communicated with the water inlet in a surrounding manner, and a second end of the cover plate extends in a direction away from the water inlet along an axial direction of the impeller and expands outwards; wherein, an annular matching surface is provided in the heating cavity; an outer side of the cover plate is wrapped with the matching surface, and there is a gap between the matching surface and the cover plate; the matching surface has a third end and a fourth end which are arranged in an axial direction of the impeller; the fourth end is arranged corresponding to the second end; and a diameter of the fourth end is greater than or equal to a diameter of the second end; wherein the cover plate comprises a straight cylindrical section and an arc expansion section which is connected with the straight cylindrical section, an end of the straight cylindrical section which is away from the arc expansion section forms the first end of the cover plate, and an end of the arc expansion section which is away from the straight cylindrical section forms the second end of the cover plate; the matching surface comprises a straight line section and an enlarging section which is connected with the straight line section, an end of the straight line section which is away from the enlarging section forms the third end of the matching surface, and an end of the enlarging section which is away from the straight line section forms the fourth end of the matching surface; the straight line section surrounds the straight cylindrical section, and the enlarging section surrounds the arc expansion section; wherein a length of the straight line section is greater than a length of the straight cylindrical section; characterized in that an end of the straight line section which is away from the enlarging section is connected with an annular bevel; and the annular bevel extends obliquely in a direction close to the straight cylindrical section along a direction from outside to inside, and in that the gap between the matching surface and the cover plate is disposed uniformly.