The invention discloses a bevelling filleting machine with an adjustable bevelling angle, which comprises a fish conveying unit, a fish cutting unit and a top supporting unit; the fish cutting unit comprises a cutter assembly, the cutter assembly performs beveling operation on fish to-be-sliced driven by a crank rocker mechanism, the cutter assembly is provided with a plurality of regular polygonjacks, and the regular polygon jack is inserted with the regular polygon jacks. According to the beveling filleting machine, the crank rocker mechanism links the cutter assembly to imitate the human bevelling operation mode, the bevelling operation is carried out on the fish to-be-sliced, the machine not only ensures the uniformity of the size and thickness of the fillet, but also adjusts the bevel angle and thickness of the required fillet by adjusting an installation angle of the bevelling cutter body. The machine has the advantages of simple structure, high slicing efficiency, strong regularity and safe and reliability of slicing process, and can satisfy the slicing operation in various use occasions.