The utility model provides a closestool auxiliary device, which belongs to the technical field of bathroom accessories and comprises a lifting mechanism, a first rotating plate, a second rotating plate and a fixing mechanism. The lifting mechanism is arranged on the periphery of the closestool; and a first rotating plate and a second rotating plate which are hinged to the top of the lifting mechanism are further arranged, a user sits on the supporting ring to go to the toilet, and after the user goes to the toilet, the user can be lifted up through the lifting mechanism, the single rotating plate and the second rotating plate to help the user stand up. According to the closestool auxiliary device, when the auxiliary device is not used, the first rotating plate and the second rotating platecan rotate towards the two sides of the closestool respectively, space is provided for the closestool cover, and the opening of the closestool can be covered with the closestool cover conveniently.