The invention discloses a comprehensive pipe rack patrolling robot track telescopic mechanism. The comprehensive pipe rack patrolling robot track telescopic mechanism comprises a track telescopic driving mechanism (1), a fireproof door (2), a comprehensive pipe rack patrolling robot (3), an aluminum alloy fixing guide rail (4) and an aluminum alloy telescopic track (5). When the comprehensive piperack patrolling robot (3) passes through the fireproof door (2), the fireproof door (2) is opened, the aluminum alloy telescopic track (5) stretches out, and the comprehensive pipe rack patrolling robot (3) can smoothly pass through the fireproof door (2). After the comprehensive pipe rack patrolling robot (3) passes through the fireproof door (2), the aluminum alloy telescopic track (5) automatically contracts back, and the fireproof door (2) is closed. The track telescopic mechanism is adopted, the passing safety of the comprehensive pipe rack patrolling robot is guaranteed, and the controlmanner is simple and flexible.