The utility model discloses a multi -functional high efficiency spanner, including the ratchet, the dual unsettled protective case that is provided with of ratchet, two protective cases pass through to constitute a complete protective housing after the screw fastens, pivort fixation is passed through on two protective cases in the ratchet center, on the protective case with the ratchet mutually together position department open and have the nut mouth, the shape and the nut appearance of nut mouth are matchd, and the salient angle of nut mouth and ratchet teeth meshing are matchd, it still is provided with the pawl to match with the ratchet in the protective housing of two protective case formation, the stiff end of pawl is connected with the one end of spring, the other end of spring is fixed in the sleeve, sleeve and protective housing are even as an organic whole, be provided with a plurality of archs on the sleeve outer wall, skid when preventing to operate the sleeve, nut mouth center, the stiff end of ratchet center and pawl point -blank, the utility model provides a spanner that exists among the prior art disassemble and be nimble inadequately when installing the nut, the problem that wastes time and energy.