The invention discloses a skin scratching device for a citrus peeling machine, and belongs to the technical field of citrus automatic processing devices. The device comprises a component conveying belt, a supporting plate, a compression belt, a sensor, a fixed support, a spring, a tool rest, a disc plate, an inverted tooth hook, a disc plate shaft A, a disc plate shaft B, a disc plate column A, a disc plate column B, a skin scratching tool tackle A and a skin scratching tool tackle B which form three large systems of citrus conveying, sensing and skin scratching tackles. The skin scratching device for the citrus peeling machine has the advantages of rapid processing speed, high accuracy, high coherence, high efficiency, and large opening, citrus meat is not damaged, particle scratching openings can be wrapped outward automatically and the like, and the efficiency of the subsequent peeling working procedure of the citrus can be improved effectively. The skin scratching device for the citrus peeling machine provided by the invention can be popularized and applied to citrus processing enterprises.