The invention discloses a numerical control card-less rotary cutter, which comprises a base, a front tool post, a rear tool post, a moving motor, compression rollers, a compression roller speed control system and a compression roller rotating motor, wherein two ends of the base are provided with upright brackets which are provided with round timber clamping mechanisms; the base is provided with a tool post slideway, and two ends of the front and the rear tool posts are arranged on the tool post slideway through slide blocks which are sleeved on a sliding leading screw; two compression rollers are arranged on the front tool post in parallel, one compression roller is arranged on the rear tool post, and the three compression rollers are arranged in a triangular shape; the base is provided with a rotary motor which is matched with the round timber clamping mechanisms through a triangular belt, a driven wheel and a big gear wheel, and the driven wheel is matched with a cutting feed speed reducer, a rear transmission gear box, a rear driving shaft and the sliding leading screw; the compression roller rotating motor is matched with the front tool post compression roller; and the motors are connected with a master control system of a computer control cabinet through conducting wires, and an integrated circuit chip is arranged in the computer control cabinet. The numerical control card-less rotary cutter solves the technical problems of rotary cutting bending and fluttering of thin round timbers and operation semi-automation in the prior art.