Fixing device of drilling machine

The utility model belongs to the technical field of drilling machines, and particularly relates to a fixing device of a drilling machine, which comprises a workbench. The top of the workbench is fixedly connected with a bearing plate. Sliding grooves are formed in the three sides of the bearing plate. Extrusion blocks are connected to the two sides in the bearing plate in a sliding manner; grooves are formed in the opposite sides of the two sets of extrusion blocks. A push plate is connected to the groove in a sliding manner; the push plate is in threaded connection with a first screw rod; the first screw rod penetrates out of one side of the bearing plate; extrusion rods are fixedly connected to one sides of the two sets of extrusion blocks; a first bevel gear is driven to rotate by rotating a handle, a second screw rod on a second bevel gear is driven to rotate through rotation of the first bevel gear, and due to the fact that extrusion plates are installed at the two ends of the second screw rod, when the