The invention discloses a nonlinear torsion spring group structure and a using method thereof. The nonlinear torsion spring group structure comprises a first mounting plate, a second mounting plate, arotary shaft and a plurality of torsion springs, wherein the first mounting plate and the second mounting plate are oppositely arranged; a through hole is formed in the middle of each of the first mounting plate and the second mounting plate; the rotary shaft is mounted in the two through holes; a plurality of mounting holes are formed in the first mounting plate; the mounting holes are in one-to-one correspondence to the torsion springs; a plurality of limiting holes are formed in the second mounting plate; the limiting holes are in one-to-one correspondence to the torsion springs; the torsion springs coaxially sleeve the rotary shaft; one end of each torsion spring is fixedly mounted in each mounting hole; and the other end of each torsion spring is mounted in the limiting hole in a sliding mode. The multiple groups of coaxial torsion springs are twisted in sequence, and bending moment and torsion angles of the torsion spring group structure are in function change, so that torsion springs can be matched according to different application scenes and different pressure. The nonlinear torsion spring group structure has the advantages of being simple and convenient to use, flexibleand various in matching way, capable of improving the spring application scene, and the like.