Preparation method of tetra-alkyl ammonium halide-SO2-H2O hydrido complex

The invention relates to a preparation method of a tetra-alkyl ammonium halide-SO2-H2O hydrido complex, which comprises the following steps of: proportionally weighing a certain amount of tetra-alkyl ammonium halide, and preparing an aqueous solution with a certain concentration; reacting with SO2 gas; and splitting the phase, wherein the lower layer is the tetra-alkyl ammonium halide-SO2-H2O hydrido complex. The aqueous solution of tetra-alkyl ammonium halide and SO2 form the hydrido complex through hydrogen bonds, and the hydrido complex can efficiently absorb the waste gas containing hydrogen sulphide, thereby efficiently recovering the elementary substance sulphur at low cost; and the hydrido complex can be regenerated by absorbing the waste SO2 gas.