Crack repairing device for highway engineering

The utility model belongs to the technical field of road repairing, in particular to a crack repairing device for road engineering, which is characterized in that a metering pump on the outer side ensures that quantitative sealant flows into a folding telescopic pipe from the inside of a material guide pipe at a constant speed, and in order to prevent the sealant from being effectively injected into a crack, an output end of an electric telescopic rod pushes a push rod; the push rod drives the plugging frame to move downwards and stretches the folding telescopic pipe, so that dust is effectively prevented from entering a nozzle of the sprayer, and the nozzle is prevented from being blocked; in the glue pouring process, a stepping motor on the outer side of a fixed cover can be synchronously started, the stepping motor drives a driving shaft to rotate, the driving shaft drives a positioning cam fixed to the outer wall of the driving shaft to rotate, and due to the fact that the positioning cam is in an irregul