In order to satisfy the need of multi-pass and multi-station laser processing, Nd:YAG pulsed laser is chosen as the light source and the laser double-pass time-sharing multiplexing system is developed. A concrete implementation scheme for time-sharing multiplexing is put forward, and in order to achieve time-sharing multiplexing beam splitting, controllable 30° revolving beam splitting device is designed, besides, a time-sharing multiplexing control circuit is designed to achieve real-time control of the device, and the system working time sequence is determined. In this way, time-sharing multiplexing and multi-pass output can be realized under the premise of not reducing the output power. Energy meter is used to collect data for calculating the light path coupling efficiency. The results of experiments show that when the current is 50 A and pulse width is 4 ms, the coupling efficiency of path A is 85.21% and that of path B is 85.23%, in the state of which the demand of multi-station processing can be met. And combined with practical applications, two splitting light paths are designed, one is used for welding and the other for melting and coating.