The invention relates to an automatic cutting machine for an artificial wood fiber board. The automatic cutting machine for the artificial wood fiber board comprises a base board, a movable pushing device is mounted at the rear end of the base board, two supporting boards are symmetrically mounted in the middle of the base board, a first supporting roller is mounted between the inner walls of the upper ends of the two supporting boards through a bearing, a cutting device is mounted at the front end of the base board, and the movable pushing device and the cutting device cooperate with each other to complete the automatic processing technology of boards. The automatic cutting machine can solve the problems that workers need to use clamps to push the boards and use a disk saw to cut the boards when using a traditional cutting method to conduct cutting processing in small-sized board processing factories, the cutting precision is low, clamps need to be replaced manually according to needs of different board widths, the labor intensity is high, the traditional board cutting method can only conduct cutting in one direction, the boards need to be processed for a second time, and the working efficiency is low; and the automatic cutting machine can achieve the function that the boards are cut automatically.