The invention discloses a three-directional rigidity experiment device of tires. The three-directional rigidity experiment device comprises a base, two sets of door-shaped frameworks which are symmetrically mounted on the base, a transverse beam, a dynamic loading device, a supporting device and clamping devices, wherein the two sets of door-shaped frameworks are fixedly mounted at the two ends of the base through bolts; the transverse beam is fixedly mounted at the tops of the two sets of door-shaped frameworks; the downward dynamic loading device is arranged in the middle of the transverse beam; the supporting device is fixedly mounted in the middle of the base and is located just under the dynamic loading device; the clamping devices are fixedly mounted on the inner sides of the two sets of door-shaped frameworks; the vertical, longitudinal and lateral dynamic rigidity of tires with different types can be measured on one set of device by replacing an acting head and adjusting experiment positions of the tires; a linear displacement sensor can be used for measuring the size of displacement in each direction and a force sensor can be used for measuring the size of stress in each direction, so that the dynamic rigidity in each direction is calculated; and compared with an existing experiment device, the three-directional rigidity experiment device is simple in structure, convenient to operate and low in cost.