The invention provides a cable bending device. The cable bending device comprises a telescopic assembly and an auxiliary supporting assembly, at least one end of the telescopic assembly is provided with a first arc-shaped plate, and the auxiliary supporting assembly is matched with the telescopic assembly to provide a fulcrum for the telescopic assembly. According to the technical scheme, the problem that when a traditional cable straightener in the prior art is used for cable bending, the adjustable range is relatively limited is effectively solved.