The invention provides a multifunctional conventional triaxial loading device which comprises a cover plate, a protruding disk, semicircular grooves, a protruding circular ring, a handle, an elastic resin plastic sleeve, screw holes, a multifunctional high-pressure hole, a loading bin, a high-pressure wire discharging nozzles, a wire outlet, oil injection holes, an upper bearing plate, a piston, a jack, a lower bearing plate, an upper base plate, a lower base plate, partition strips, a large screw, a small screw, a large pad, a small pad and a hook, wherein the handle is arranged on the side face of the cover plate; the multifunctional high-pressure hole is formed in the side face of the cover plate; the high-pressure wire discharging nozzles are symmetrically distributed on the two sides of the outer wall of the loading bin; the oil injection holes are symmetrically formed in the two sides of the outer wall of the loading bin; the piston is connected with each of the upper bearing plate and the lower bearing plate; the four partition strips are symmetrically arranged on the lower base plate. The multifunctional conventional triaxial loading device can perform both a conventional triaxial loading test on a cubic concrete test piece and a triaxial loading test on a model similar to the coal mine well wall; the loading device is easy to carry.