The utility model discloses an easy maintenance, thick cadmium smelting furnace of regional accuse energy -concerving and environment -protective rectangle of temperature of branch. The utility model discloses a method includes: stove outer covering, furnace wall, heating pipe, automatic temperature control system, characterized by adopts the rectangular furnace body structure to carry out the regional heating of branch with the heating pipe to the crucible. This technical scheme can smelt area temperature by the accurate control, is favorable to the separation of cadmium metal and smelting slag, improves and smelts efficiency, heating pipe long service life, the furnace body is the rectangle structure, and the heating pipe installation of being convenient for is maintained, temperature control system has temperature -controlled precision height, little, the convenient operation of buffering, longe -lived, noiseless, overcomes the calorescence automatically.