In view of the diversification and complexity of power system operation scenarios, a network planning model considering transmission congestion is proposed, which considers the transmission congestion scenario caused by the neglect of uncertainty in traditional transmission network planning. The multi-constraint model is used to determine the active power of generators and user loads under different transmission scenarios; the economic dispatch model is used to establish the constraint model of transmission network planning considering congestion scenarios; and the improved multi-constraints satin-bowerbird optimizer (MCSBO) is used to solve the multi-constraint transmission network planning model. The effectiveness of the proposed planning method is verified by a simplified 6-node power network in a city. The results show that after the planning, the congestion degree of different scenarios is significantly improved, the average congestion degree of transmission is 0.49 before the planning, and it is reduced to 0.09 after the planning, which is about 4.4 times higher.