The invention discloses a centripetal force tester, which comprises a support rod, the upper and lower sides of the support rod are provided with card slots, the outer wall of the support rod is sleeved with a fixing device, and the bottom end of the fixing box is installed with An upper assembly plate, a lower assembly plate is installed on the bottom end of the upper assembly plate, a slide bar is installed on the top end of the lower assembly plate, and a force sensor is installed on the bottom end of the lower assembly plate. In this centripetal force tester, when it is necessary to adjust the position of the force sensor, pull the fixed box to the left or push the fixed box to the right, squeeze the stuck ball through the support rod, make the stuck ball squeeze the push rod, and the push rod presses the sliding plate, which can make the push The rod drives the slider to slide and press the spring on the concave slide plate, so that the ball enters the fixed box. When the ball reaches the position of the adjacent groove, the spring springs the sliding plate, so that the push rod drives the ball back into the groove Inside, the fixed box can be firmly fixed on the pole, and the fixed box can be pulled to a suitable position on the pole according to the needs of use.