Municipal engineering construction warning device

The utility model relates to the technical field of warning devices, in particular to a municipal engineering construction warning device which comprises a base, a first groove is formed in the upper surface of the base, a rectangular groove is formed in the upper surface of the first groove, and a round hole is formed in the rectangular groove. According to the municipal engineering construction warning device, through the cooperative arrangement of the first groove, the rectangular groove, the round hole, the second supporting frame and the warning plate, when the municipal engineering construction warning device is used, a worker rotates the second supporting frame, then folds the second supporting frame behind the warning plate, then pulls the warning plate and rotates the warning plate backwards into the first groove, and when it rains, the warning plate can be folded into the first groove; rainwater can be drained through a round hole in a rectangular groove, so that the rainwater is prevented from bein