The invention relates to a portable multifunctional soil mechanical property test device. The portable multifunctional soil mechanical property test device comprises an upper rigid beam, a lower rigid beam, a rigid threaded column, an upper stress application mechanism, a lower stress application mechanism, a water tank, a test tank, a measuring mechanism and an infiltration mechanism, wherein the middle part of the lower rigid beam is provided with the lower stress application mechanism, the lower stress application mechanism is provided with the water tank, the test tank is arranged in the water tank, the upper rigid beam is arranged on the lower rigid beam in an up-down moving manner through the rigid threaded column, an inner screw hole is formed in the middle of the upper rigid beam, the upper stress application mechanism passes through the inner screw hole and is connected with the test tank through the measuring mechanism, and the test tank is communicated with the infiltration mechanism through a water guide pipe. Compared with the prior art, the portable multifunctional soil mechanical property test device is simple in structure, convenient to carry and easy to operate; soil tests can be conveniently carried out in an engineering field, the test error can be effectively reduced, the working efficiency is high, the practicability is high, and the application range is wide.