The invention relates to a mode control type automatic working medium filling machine which comprises a working medium storage tank, a buffer tank, a heater, a working medium mode control tank, a working medium recovering tank, a filling head, a press sealing head and two cylinders. According to the invention, quick and accurate working medium filling and sealing to a network heat transmitter containing a tube-like, ring-like, platelike or complex channel can be achieved through a device for adjusting working medium state in advance and a mechanical operation system, the operation is simple and convenient, the filling is quick and accurate, particularly, the effect of fast and accurate filling to working medium in the network heat transmitter containing a small pipeline and a complex micro channel is more remarkable.