Plastic continuous injection molding machine

The present invention relates to a plastic continuous injection molding machine, which comprises a main platform, a nozzle, a flow channel exchange base, a primary injection unit, an auxiliary injection unit, a flow channel exchange shaft, a crank arm and a power cylinder. The nozzle on the main platform is fitted corresponding to the flow channel exchange base, on which an axle hole and primary and auxiliary flow channels communicated to the axle hole are provided. The primary and auxiliary injection units are linked and communicated to the primary and auxiliary flow channels of the flow channel exchange base, respectively. The flow channel exchange shaft is fitted inside the axle hole and provided with primary and auxiliary passages, respectively corresponding to the primary and auxiliary injection units. The flow channel exchange shaft is linked to the crank arm at one end thereof, and the crank arm is driven by the power cylinder so as to allow the flow channel exchange shaft to displace and change the po