With the development of heavy-duty launch vehicles, the weight of servo actuator increases significantly due to its power level. Traditional materials and structural design methods are difficult to further improve the power to weight ratio of products. Carbon fiber composite materials have advantages of low density, strong design ability, high strength, high modulus, corrosion resistance, fatigue resistance, etc., and have been widely used in aerospace fields such as large structural parts. Servo actuator is the key equipment for engine thrust vector control, and its weight reduction is of great significance. Relevant research has been carried out on carbon fiber actuators in domestic and international, but there is no mature engineering application case in China. According to characteristics of servo actuator in aerospace, aiming at engineering applications, this paper carried out relevant research from the aspects of structure design, layering design and simulation, surface enhancement methods of friction pairs and forming process methods. A carbon fiber composite servo actuator prototype has been designed and manufactured, which achieved a weight reduction of 49.2% compared with metal actuators of the same specifications. The prototype has completed relevant hydraulic tests, and its functional performance is comparable to that of existing actuators, and it has preliminarily obtained the technical basis for future engineering application, which has played an active role in promoting the launch vehicle's transport capacity and reducing energy consumption.