Due to some limitations for the applicability and location area of trilateral localization algorithm, a four-LED weighted positioning algorithm is proposed.By utilizing the characteristics of indoor visible light transmission such as the short distance and high positioning accuracy, in the mean time, considering the actual situation of deployment of LED indoor lighting, the transmission distance information as a weighted factor is introduced in the positioning algorithm to improve the positioning accuracy and expands the location area.Simulation results show that the proposed location algorithm is guaranteed to achieve average positioning error below 18 cm in 5 m×5 m×3 m space area, and effectively improve the indoor positioning precision and universality of application and system robustness.