Electric aircraft is booming in the field of general aviation domestic and international, and affects the future development direction of aviation. Using electric propulsion technology to transform UAV can greatly improve the safety, reliability and maintainability of UAV and reduce the use cost. SW1 UAV was took as the object of electric transformation, the electric transformation scheme was proposed, the main parameters of motor and lithium battery pack in the electric propulsion system were calculated and analyzed in detail, and the feasibility of the transformation of the UAV was analyzed from the weight, center of gravity, performance and the installation form of the electric propulsion system. The results showed the electric transformation of SW1 UAV was feasible,and the problems that need to be paid attention to the subsequent transformation were put forward.