The utility model discloses a cavity heat is moulded plate voltage and is prolonged evacuator with adjustable, including extruder and calender, be provided with at least a pair of stack on the calender, form horizontally panel between the mated stack and roll the passageway, the calender front end is provided with the conveyer belt of carrying the material for panel calendering passageway, and the extruder rear end is provided with the extrusion die, and the discharge gate of extrusion die lies in the conveyer belt top, and the calender front end can be dismantled the level of being connected with and extend the strip body in the income panel calendering passageway. The beneficial effects of the utility model are that: structural design is reasonable, can adjust fast according to the production requirement is nimble to can produce the area not unidimensional with the heat shape of cross section through -hole mould the board, with low costs, labour saving and time saving has improved production efficiency greatly.