The invention discloses a stacking machine stock bin based on automatic feeding and discharging of a numerical-control machine tool. The stock bin comprises a vertical shaft, a transverse shaft, vertical shaft guide rails, a vertical shaft curved column, secondary positioning supports, a transverse shaft sliding bar, a transverse shaft same-distance driving motor, transverse shaft guide rails, a transverse shaft limiting block, a left arm, a right arm, a vertical shaft lower limiting block, tray limiting blocks, trays, a vertical shaft positioning sensor, a vertical shaft limiting sensor, a transverse shaft curved column, a vertical shaft variable-distance driving motor, a right arm variable-distance cylinder, a supporting plate and a transverse shaft motor installing plate, wherein a base is arranged at the bottom of the vertical shaft through screws, the vertical shaft curved column and the secondary positioning supports are arranged on the top of the vertical shaft, the vertical shaft guide rails and the vertical shaft lower limiting block are arranged on one side of the vertical shaft, the transverse shaft is connected with the vertical shaft guide rails in a matched mode through gears, and the transverse shaft guide rails and the transverse shaft sliding bar are arranged on the transverse shaft. The stacking machine stock bin is simple in structure, and production cost is reduced; a PLC can be independently adopted for control.