The utility model relates to an injecting mechanism of a full automatic multifunctional rubber-plastic injection moulding machine. The injecting mechanism is provided with two injecting guns (28) and (29) which have the same structure. A lifting pull rod (3) is arranged on a rear fixing seat (2) of a guide rod, and connected with a hydraulic device (3). The injecting gun (28) is used for injecting the bottom color and forming color, and the other injecting gun (29) is only used for injecting the bottom color. An injecting head (22) consists of an injecting embedding sleeve (23), a nozzle inner ball (24), a nozzle outer ball (25) and a nozzle press cover (26), and is adjusted by the inner ball and the outer ball. The nozzle inner ball (24) and the nozzle outer ball (25) are in spherical fit. The utility model changes the traditional phenomena that only single color is injected; the colors are mixed when two colors are injected, so the rubber-plastic injecting moulding machine can be used for injecting two colors simultaneously, and the effects of procedure reduction and efficiency enhancement are achieved.