Plastic sheet material positive pressure thermo shaping machine

The utility model relates to a plastic forming machine, in particular to a plastic piece material positive pressure hot former. The utility model comprises a punch die and a punch device and is characterized in that the punch device consists of an elbow-rod mechanism, an oil cylinder and a gas cylinder; the elbow-rod mechanism consists of a fixed pin (2) fixed on a lower die (1), a moveable rod (3), a crank (4) and a fixed pin (5); two ends of the moveable rod (3) are movably connected on the fixed pin (2) and the crank (4) by a shaft; the crank (4) is also respectively movably connected with the cylinder piston (6) and the fixed pin (5) by the shaft; the fixed pin (5) is fixed on a pushing plate (7); the lower surface of the pushing plate (7) is provided with the oil cylinder. The utility model solves the problems of large volume, complex structure and high energy consumption of the current product. The utility model has the advantages of small volume, light weight, stable work, being quiet, simple operation, low manufacture cost and high work efficiency; the utility model can save the energy source farthest, and compared with the other machine types, can save the electricity by 5-10KW per hour.