The invention discloses a laser checking device, and relates to the technical field of electric power overhauling. The device comprises a laser head, a convex lens and a laser light source, laser emitted by the laser light source is diverged through the convex lens and then passes through the laser light source, grating light through holes are formed in the laser head, the degree of the convex lens is adjustable, the grating light through holes are parallel grating light through holes, and the parallel grating light through holes are in a rectangular shape. By means of the scheme, parallel checking rays can be emitted and directly illuminate a terminal board, working personnel can visually determine the loop wiring position of the terminal board through observation of the checking rays, whether or not wiring is correct can be judged, it is convenient for the working personnel to conduct wiring work on the terminal board, occurrence of wiring by mistake is effectively reduced, and stable operation of substation equipment is guaranteed.