Mother alloy bar cutting device

The utility model belongs to the technical field of cutting devices, and particularly relates to a mother alloy bar cutting device which comprises a cutting platform, and a clamp, a cutting knife piece, a pushing device and a supporting baffle are sequentially arranged on the cutting platform. A clamping block is arranged at the tail end of the telescopic diameter adjusting structure; a graduated scale is arranged on the upper surface of the cutting platform in the length direction; the clamp can be suitable for clamping mother alloy bars with different diameters, and the problem that an existing device cannot clamp the mother alloy bars with different diameters is solved. On one hand, the supporting baffle supports the mother alloy bar, on the other hand, the supporting baffle is aligned with the graduated scale according to the needed cutting length and moves to the corresponding position, the mother alloy bar is cut by moving the cutting knife part, and after cutting is completed, a telescopic rod of the p