The invention provides a production line for a six-layer co-extruded one-step-process wood-plastic composite (WPC) floor. The production line comprises extruding machines, a mold, a five-roller molding machine, a cooling support, a two-roller embossing molding machine, a support, a pull machine, a plate shearing machine, a conveying support and an automatic plate lifting machine; the mold is mounted on the extruding machine and is matched with the five-roller molding machine to directly send an extruded material into the five-roller molding machine; the cooling support is arranged at the outlet of the five-roller molding machine and is matched with the five-roller molding machine to cool a floor pressed and molded by the five-roller molding machine; the two-roller embossing molding machine is arranged at the back part of the cooling support and is connected with the pull machine through the support; the pull machine is connected with the plate shearing machine and the conveying support; and the automatic plate lifting machine is arranged at the tail end of the conveying support.