The invention relates to a dual-gravity geological compass which comprises an outer frame and a compass body arranged in the outer frame, wherein the compass body comprises an inner shell and a pointer rotating shaft arranged in the inner shell; a dial and a magnetic pointer and a steel pointer which can rotate around the pointer rotating shaft are arranged in the inner shell; the compass body further comprises two inner shell rotating shafts; the upper end and the lower end of the inner shell are respectively connected with the outer frame in a rotating manner through the two inner shell rotating shafts; the axial lines of the two inner shell rotating shafts are overlapped with the middle line of a cover shell; when a space inclination angle is measured, the compass body rotates under the gravity action, and vertical calibration is implanted, so that the steel pointer can rotate in a vertical plane under the gravity action, and the measurement precision of the compass is improved. Compared with the prior art, the dual-gravity geological compass has the advantages that the measured angle is precise, subjective judgment interference is avoided and the like.