In order to solve the problems of low design efficiency and lack of visual construction caused by manual electrical circuit generation of electrical components in existing three-dimensional building electrical design,a three-dimensional building electrical automatic wiring design scheme based on hybrid particle swarm is proposed. A mathematical model of three-dimensional wiring conforming to standard and national standard is established. Based on objective functions such as the room type, the circuit partitioning strategy is proposed for initializing floor plans. Integrated circuit path length, and the number of elbow and energy constraint are optimizedfor the objective function to calculate the optimum electrical floor room 3D automatic wiring design. Finally, thefeasibility of the design is verified by the simulation results.