Warning device for municipal engineering construction

The warning device for municipal engineering construction structurally comprises a supporting mechanism and a stabilizing mechanism, a left supporting fence and a right supporting fence are mutually pulled open, the warning device moves under the action of pulleys at the inner ends of a first sliding groove and a second sliding groove, and a display panel is pulled out of a collecting groove through a connecting rod; a stable plate in a stable groove is turned out, a rotary knob is rotated to drive a screw rod to discharge a discharge plate at the lower end, anti-skid nails make contact with the plane, then a supporting rod is turned out of a supporting groove, and fixing nails are pushed by a pressing plate to be discharged out of a pressing groove to be inserted into the ground to be fixed. The municipal engineering warning board solves the problems that most of existing municipal engineering warning boards are large metal boards, but the warning boards need to be carried by large freight vehicles when bein