An alternative method has been proposed for converting PVC wastes to energy. Dechlorination efficiency was enhanced by co-HTC with lignocellulosic biomass. Organic chlorine was transformed into the inorganic chlorine via the HTC process. The dechlorination performance of lignocellulose was given: lignin > cellulose > hemicellulose. Lignin can adjust the particle sizes of hydrochars by inhibiting the agglomeration.