The invention relates to a waste heat collecting and recycling method in the solidification course of liquid calcium carbide, which comprises the following steps: the liquid calcium carbide which is emitted from the mouth of a calcium carbide furnace flows into calcium carbide pots which are placed on an annular transportation trolley one by one; the annular transportation trolley loaded with the calcium carbide pots passes through a calcium carbide waste heat collecting box and calcium carbide exchanges heat with water; and the generated hot water is transmitted to a water storage tank through a water discharge pipeline and finally transmitted to a user pipe network through the pipeline. The method provided by the invention realizes recycle of the waste heat in the production course of the calcium carbide and has the obvious effects of saving the energy sources, lowering the production cost, improving the production environment, realizing clean production.