An automatic fish slicing and bone removing knife comprises blades arranged on left and right sides as well as a bone clamping fork arranged between the two blades, wherein the blades are close to the outer side of the bone clamping fork, the included angle formed by two fork arms of the bone clamping fork is 30 degrees, and the length of each fork arm is a half of that of each blade. The knife solves the problem that a live fish slicing and bone removing device is lacked at present, is simple and practical in structure and has great marketing value.