The invention belongs to the field of snow melting and deicing and particularly relates to an efficient-corrosion-inhibition compound chloride salt type snow-melting agent and a preparation method thereof. The efficient-corrosion-inhibition compound chloride salt type snow-melting agent comprises sodium chloride, calcium chloride dihydrate, a corrosion inhibitor and auxiliaries, wherein the corrosion inhibitor comprises sodium hexametaphosphate, sodium molybdate, sodium benzoate, sodium gluconate, zinc dihydrogen phosphate, sodium tartrate, sodium tripolyphosphate, sodium silicate, sodium lignin sulfonate, sodium citrate, benzotrizaole and thiourea; the auxiliaries comprise sodium carboxymethyl cellulose, urea and povidone. The efficient-corrosion-inhibition compound chloride salt type snow-melting agent which is granular solid has the advantages that the snow-melting agent is suitable for large-scale mechanical throwing operation and excellent in corrosion inhibition effect, and the deicing and snow melting ability of the snow-melting agent can be brought into full play in aspects such as city and rural roads, highways, rail transit, airports, squares, courtyards and bridges.