Marking device for road construction

The utility model belongs to the technical field of roads, and particularly relates to a marking device for road construction, which comprises a support frame, universal wheels are arranged at the bottom of the support frame, a box body is arranged at the top of the support frame, a feeding hole is formed in the top of the box body, a water pump is arranged at the top of the box body, and a water pumping pipe is arranged on the surface of the water pump. A water inlet pipe is arranged on the surface of the water pump. The first telescopic device is arranged at the top of the supporting frame, the first telescopic device lifts the sweeping device to a proper height, a second motor drives a second rotating shaft to rotate, the sweeping device rotates to sweep the ground, the situation that follow-up line drawing is affected and incomplete line drawing is caused due to the fact that objects such as garbage exist on the ground is prevented, and the practicability of the device is improved; the second telescopic d