The invention discloses a brushing device based on building maintenance, and relates to the technical field of building maintenance.The brushing device based on the building maintenance provides the following scheme to solve the problems that when an existing wall body is repaired, a worker needs to climb high for brushing, labor is wasted, trouble is caused, and the automatic air drying efficiency is low. The brushing device comprises a containing plate, a lifting mechanism is arranged at the top of the containing plate, the lifting mechanism is connected with a brushing mechanism, a drying mechanism is arranged above the brushing mechanism, a storage box is arranged on the right side of the top of the containing plate, a feeding mechanism is arranged at the bottom of the storage box, a stirring mechanism is arranged above the feeding mechanism, and an air blowing mechanism is arranged above the stirring mechanism. According to the brushing device based on the building maintenance, automatic lifting brushing is facilitated, the brushing efficiency and quality are guaranteed, air blowing drying can be conducted conveniently in time during brushing, the wall body drying efficiency is improved, and the whole device is driven by one machine, diversified in function, high in integration degree and suitable for market popularization.