With the increasing use of plastic products, the environmental pollution has become more and more serious, and it also prompts us to focus on the urgent problem: how do we deal with the waste plastic? This work develops a facile procedure to convert waste polyvinyl chloride (PVC) into tantalum carbide@carbon, via the chemical reaction of waste PVC, tantalum pentoxide, and metallic lithium in a stainless-steel autoclave at 700 degrees C. The structures, compositions, and morphologies of the as-obtained products have been investigated by X-ray diffraction pattern and electron microscopy. Furthermore, the effect of the reaction temperature on the composition and morphology of the as-obtained products has been investigated. The possible formation mechanism of tantalum carbide has also been briefly discussed.