The invention relates to a measurement device for axial loading of a bearing of a loading device. The device comprises a loading seat, a sleeve, a loading nut, a sensor, a ball and a gland, wherein the loading seat is provided with a through hole with the cross section being in a convex shape, the inner wall at the large aperture of the through hole is fixedly connected with the sleeve, and the inner wall at the small aperture of the through hole is in threaded connection with the loading nut; the sensor is connected to the inner wall of the sleeve in a sliding way, one end face of the sensor is provided with a concave pit corresponding to one end of the ball; one end face of the loading nut is in contact with the other end face of the sensor in a supporting way, and a data line of the sensor is led out from a passing hole between the two ends of the loading nut and is connected with corresponding data acquisition processing equipment; and one end face of the gland is provided with a locating concave pit corresponding to the other end of the ball, and the other end face of the gland is corresponding to an outer ring of the bearing to be loaded and measured. According to the device, not only can continuous loading be realized, but also the magnitude of the loading can be measured in real time.