The utility model relates to an intake and exhaust valve which is characterized in that the valve comprises a valve board, valve slices and lift limiters, wherein the valve board is provided with an air intake and an air outlet; the middle part of the valve board is provided with a connecting round hole; the intake valve slice is blocked at the bottom of the air intake; the center of circle part of the intake valve slice is provided with a round hole; the outlet valve slice is blocked at the top of the air outlet; the center of circle of the outlet valve slice is also provided with a round hole; the air outlet lift limiter is composed of an arc post arranged above the outlet valve slice; the air intake lift limiter is composed of an arc steel disc; the center of circle is also provided with a round hole. The utility model also comprises rivets so as to connecting the outlet valve slice, the intake valve slice, the air intake lift limiter and the valve board into a whole. In addition, the utility model has the advantages of simple and brief structure and the convenient and reliable operation.