The invention belongs to the technical field of agricultural and sideline product drying, and particularly relates to a far infrared variable air volume comprehensive drying system. The far infrared variable air volume comprehensive drying system comprises a drying room, multiple ground mounting mechanisms are arranged on the ground of the drying room, multiple top mounting mechanisms are arrangedon the top of the drying room, the ground mounting mechanism and the top mounting mechanism are provided with far infrared electric heating plates, the far infrared electric heating plate on the ground mounting mechanism and the far infrared electric heating plate on the top mounting mechanism are oppositely arranged, and a dehumidifying system is arranged in the drying room and comprises an airinlet mechanism and an exhaust mechanism. In order to solve the problem in the prior art, the far infrared variable air volume comprehensive drying system which can improve the exposure rate of far infrared radiation on a product, and adjust the air circulation rate to ensure a uniform and efficient drying product is provided.