Treatment method of waste solar cell

This method for processing a waste solar cell is a method for continuously processing a waste solar cell, and is characterized by comprising a heating step for heating a solar cell module having a resin-made back sheet or the like in a thermal decomposition furnace, thereby melting a resin component contained in the solar cell module, and heating the solar cell module in the thermal decomposition furnace. Oxygenolysis is carried out; the heating step is performed by moving a solar cell module in a furnace from an inlet to an outlet of a thermal decomposition furnace in a state where the solar cell module is placed on a porous ceramic support body (A) and the ceramic support body (A) is placed on a porous material (B) on which a transition metal oxide is supported; furthermore, the thermal decomposition furnace includes a temperature raising part in a stage in which the temperature of the solar cell module rises and a combustion part in a stage in which the resin component undergoes oxygenolysis, and the oxyge