The invention provides a maintaining device. The maintaining device comprises two maintenance platforms. Each maintenance platform comprises a platform pedal, a ladder assembly, a supporting structure and a movable device, wherein the ladder assembly is arranged at one end of the platform pedal, and a connection structure is arranged at the other end of the platform pedal; the supporting structure is arranged below the platform pedal and used for supporting the platform pedal; the movable device is arranged below the supporting structure and the ladder assembly and used for conveying the maintenance platform. The two maintenance platforms are assembled and connected through the connection structures of the platform pedals. The shape after the two maintenance platforms are assembled and connected is matched with the shape of a headstock to be maintained, the maintaining device can be closer to a windshield wiper, glass and the like of the motor car headstock after assembly as the platform pedals with radians are arranged, the structures can be maintained and subjected to other treatment directly, the safety problems like falling off are avoided, and the maintenance and replacement efficiency and operation safety of the windshield wiper, glass and other components of the motor car headstock can be effectively improved.