Abstract: The present invention refers to an interchangeable system for support and actuation of rotary injection molds, used for the manufacture of plastic multi-component parts. This system is easily installed on conventional injection molding machines. The support system (13) is constituted by a main body that includes a sliding device and a rotary mechanism. The longitudinal sliding device is driven by cylinders (8 and 23) and is supported by the arms of the support (9, 15). A rotary unit, including motorization (20) is coupled to the sliding device with two rotary support platens, upper (7) and lower (17). The central mold (4) is supported between the rotary support platens (7 and 17). The frontal mold (12) is fixed on the interior part of the support which is in-turn fixed to the machine platen. The rear mold (2) is fixed to the moving platen of the injection machine (1) as usual. The invention permits not only a rapid mold mutation but also an easy reinstallation on different injection machines.