Automatic feeding apparatus of a sub-material of a meat product for automatically feeding a sub-material into meat during processing of meat. It comprises a needle pressing mechanism (2) and a sub-material supply container (3) can be easily detached and cleaned from an operating part (1). A pair of horizontal beams (5a, 5b) are arranged side by side on upper and lower portions of an operating part (1) provided on a guide bar (7), and coupling holes (2a, 3a) coupled respectively to the horizontal beams (5a, 5b) are formed on both side surfaces of the needle pressing mechanism (2) coupled to the operating part (1) and the sub-material supply container (3), such that the needle pressing mechanism (2) and the sub-material supply container (3) are locked), wherein the operating part (1) is configured to be moved up and down by a stroke set by an operating part driving means.
