The invention belongs to the field of mechanical automation engineering, and particularly relates to an accessory with top bracing and supporting integrated. The accessory comprises a box body part, a left top bracing mechanical arm system, a right top bracing mechanical arm system and a supporting jettison system. The left top bracing mechanical arm system and the right top bracing mechanical arm system are the same in structure and are symmetrically installed at the two sides of the box body part. The supporting jettison system is installed on the box body part and located between the left top bracing mechanical arm system and the right top bracing mechanical arm system. The left top bracing mechanical arm system and the right top bracing mechanical arm system are mainly responsible for conveying/withdrawing a top bracing hydraulic cylinder to specific positions, and early-stage guarantee work is done for supporting. The supporting system is mainly responsible for conveying/withdrawing a supported safety framework to a specific position, and thus an exit passageway can be provided for rescue work of rescue workers. According to the accessory with top bracing and supporting integrated, the top bracing function and the supporting function are integrated; the structure is simple, the number of support devices is small, and operation is easy; and the accessory can be mounted on a large engineering vehicle quickly, a rescue path can be quickly set up in ruins in a remote mode, safety of the rescue workers is guaranteed, and persons in distress can be rescued in time.