The invention discloses an electromagnetic loading triaxial rheological testing device. The electromagnetic loading triaxial rheological testing device can load electromagnetic force onto a soil sample and exerts constant axial force on the soil sample. The electromagnetic loading triaxial rheological testing device comprises a base for fixing the soil sample, an upper electromagnet and a lower electromagnet, wherein the upper electromagnet and the lower electromagnet are arranged on the axial two ends of the soil sample; the upper electromagnet is axially connected with a pressure rod above the soil sample. By controlling the current in the electromagnets, different magnitudes of constant axial force can be exerted onto the soil sample to achieve triaxial rheological testing on the soil sample. The electromagnetic loading triaxial rheological testing device can accurately and rapidly load the constant axial force onto the soil sample to achieve constant force loading within one step and meanwhile is good in controllability, accurate in measurement and good in system stability.