Underwater resistance reduction device for ship and ship

The utility model discloses a ship underwater resistance reduction device and a ship. The underwater resistance reduction device for the ship is arranged in the ship and located on the side, away from water, of an outer plate of a ship body, and the resistance reduction device comprises a heating module, a control module and an energy supply module; wherein the heating module is arranged on the side, away from water, of a ship body outer plate, the heating module is connected with the control module and the energy supply module, and the energy supply module is connected with the control module; wherein the heating module is used for heating a ship hull plate; the control module is used for controlling the energy supply module to provide energy needed by heating for the heating module. The heating module is arranged on the inner side of the ship body outer plate to heat the ship body outer plate, so that the temperature of water in a boundary layer with a certain thickness on the surface of the ship body outer