Cantilever crane accessory cutting tool

The utility model relates to an arm support accessory cutting tool which comprises a machine tool frame, a connecting plate assembly and a supporting plate assembly, the connecting plate assembly comprises a plurality of parallel connecting plates, the connecting plates are vertically arranged in the machine tool frame at equal intervals, and the two ends of each connecting plate are connected with two first baffles respectively. The supporting plate assembly comprises a plurality of supporting plates parallel to one another, the supporting plates are perpendicular to the connecting plates and connected with the connecting plates in an embedded mode through the upper clamping grooves and the lower clamping grooves, the two sides of the connecting plate assembly on the supporting plates are each connected with a connecting piece, and the two sides of each connecting piece are in threaded connection with the adjacent connecting plates through a pair of bolts. When the supporting plate is damaged and needs to be