Auxiliary guide device for conveniently controlling section size of underground excavation pipe gallery

The utility model provides an auxiliary guide device capable of conveniently controlling the section size of an underground excavated pipe gallery. The device comprises a screw rod support, a cross rod and a laser lamp, the screw rod support is fixed to the top of a section layer, the screw rod support sequentially penetrates through a guide ring and a fixing ring, the screw rod support is movablysleeved with a fastening device, the fastening device is matched with the guide ring, and the fixing ring is fixedly connected with the screw rod support; the guide ring is fixedly connected with theadjusting ring through the connecting support, and a handle of the laser lamp sequentially penetrates through the adjusting ring and the guide ring. The cross rod is fixed to the side wall of the section layer, and a drop hammer is arranged on the cross rod in a sliding mode and matched with the laser lamp. According to the utility model, the laser lamp emits linear laser; the height of the guidering can be adjusted accor