Vacuum drying device with waste heat recovery function

The invention discloses a vacuum drying device with a waste heat recovery function, belongs to the field of drying devices, and provides a vacuum drying device for recovering steam phase change waste heat and uniformly distributing heat through stirring in order to solve the problems that a traditional vacuum drying device is long in overall drying time, high in energy consumption and prone to wrinkling on the surface of a material. Comprising an outer cylinder, an inner cylinder, an interlayer, a heat pump, a vacuum pump, a sealing head, an annular flat cover and a fan, the design of a heat pump and evaporator two-in-one heat exchanger is adopted, steam condensation and waste heat recovery are achieved at the same time, heat can be absorbed from an air source in a time-sharing mode to heat a working medium, and the working medium can be recycled through measures such as stirring homogenization, steam retention and condensation control. Acceleration and energy conservation of the vacuum drying process are ach