The invention discloses a novel water agent washing liquid reservoir. The novel water agent washing liquid reservoir comprises a bottom plate and a vertical plate enclosing the bottom plate; the bottom part of the vertical plate is smoothly transited to the bottom plate and forms a ship-shaped structure jointly with the bottom plate; the front end and the rear end of the bottom plate are separately provided with a sewage draining opening; the upper side of the bottom plate is provided with a heating layer in a clinging manner; a heating wire which is distributed in a snakelike shape is embedded in the heating layer; a temperature sensor is arranged on the vertical plate; a rotary roll which can translate parallel to the bottom plate is arranged above the bottom plate; and the rotary roll is externally sleeved with a grease absorption cotton sleeve. The novel water agent washing liquid reservoir is of a ship-shaped structure, and no dead corners exist, so that bottom rubbing and cleaning are easy; the heating layer is arranged, and heating and temperature controlling on water agent washing liquid are realized in a mode of electrifying the heating wire, so that a good cleaning effect of the water agent washing liquid is ensured; and when the rotary roll rotates, grease floating on a liquid surface can be absorbed and removed through the grease absorption cotton sleeve.