The invention discloses a high-speed feeding load calibration device for a numerical control machine, comprising an oil tank, a hydraulic circuit block, a check valve, a rectifier plate, an electro-hydraulic proportion speed regulating valve, a hydraulic control check valve, a hydraulic motor, a gear, a rack guide rail, a spindle tool holder, a Hall current sensor, an amplifier, a data acquisition card and a calibration processor. When calibrating, the hydraulic motor, the hydraulic circuit block and a valve group form a hydraulic system, the hydraulic motor is connected with a spindle via the engaging movement of the gear and the rack, thus converting the high-speed feed movement into the rotary motion of the gear. The invention realizes the control of the device, the acquisition and analysis of calibration data and the calibration of the relationship between an axial feeding load and the feeding motor current. The device, a popular type calibration instrument, has low manufacturing cost and can be widely applied to the calibration of the numerical control machines in a manufacturing shop.