The invention discloses a corncob pith cutting and obtaining device for food chemical industry. According to the corncob pith cutting and obtaining device, corncobs are distributed to be consistent through vibration, then corncob piths with the high pentosan content are separated from other positions and separately extracted through annular cutting, and the grade of processed raw materials is increased. The corncob pith cutting and obtaining device is characterized in that a plurality of supporting columns are arranged on one side of a bottom plate, one end of the bottom plate is lower than the other end of the bottom plate, and a vibrating net is arranged on the bottom plate and is close to the other end of the bottom plate; a vibrating motor is placed on the bottom plate, side wing baffles are arranged at the edges of the two sides of the bottom plate, and a plurality of partition plates are arranged on the bottom plate in parallel; the partition plates and the side wing baffles areparallel, the partition plates extend from one end of the bottom plate to the middle of the bottom plate, and the multiple partition plates and the flange baffles on the two sides divide the bottom plate into sliding grooves with the same width; and an arc-shaped press plate is placed between every two adjacent partition plates and located at one end of the corresponding sliding groove, and a guiding plate is placed between every two adjacent partition plates and located at the other end of the corresponding sliding groove.