The invention discloses rigidity simulating device capable of automatically adjusting. The simulating device mainly comprises slide rods, a support plate, a double-head screw, a coupler, a speed reducer and a direct-current motor. By adjusting the contact positions of the two slide rods and the support plate, the actual bearing and deformation length of the support plate is adjusted, and the rigidity of the device is adjusted. The rigidity simulating device has the advantages that the rigidity simulating device is simple in structure and high in reliability; the simulating device with a certain rigidity range is designed in a targeted manner by specific parameter design; automatic rigidity adjusting of the device is achieved by the direct-current motor, and the device can be well integrated with a electric testing platform; the technical scheme of the invention can be adjusted according to needs, automatic adjusting of the rigidity simulating device can be achieved by the direct-current motor, and a hand wheel plus a locking device can be used if cost needs to be lowered.