Underground complex natural gas pipeline leakage monitoring and early-warning device

The invention discloses an underground complex natural gas pipeline leakage monitoring and early-warning device which structurally comprises a display, control switches, indicator lights, a lifting tooth groove, a main monitoring tank, an early-warning loudspeaker, rollers, a connecting plate, a hand-operated lifting device, a lifting rod, a control tank, a handrail and a handrail sleeve. The display is embedded into the front surface of the control tank and is in clearance fit to the control tank; the control switches are arranged under the display; the control switches and the display are located on the same plane; the indicator lights are embedded into the front surface of the control tank and is in clearance fit to the control tank; the lifting tooth groove is formed in the lifting rod; the lifting tooth groove and the lifting rod are of an integrated structure; and the top surface of the main monitoring tank fits to the lower surface of the hand-operated lifting device. Accordingto the underground comple