A new method is proposed to solve the problem of finite-time synchronization transmission of signal in the current modulated semiconductor laser. Firstly, the characteristics of current modulated semiconductor laser are analyzed theoretically. Then, the unique sliding mode surface and sliding mode controller are designed to achieve the finite-time synchronization transmission of the target signal by using sliding mode control method. The results show that the technology can not only ensure that the current modulated semiconductor laser can complete the synchronization transmission of the target signal in a finite time, but also control the convergence speed of the sliding surface by simply adjusting the parameter in the sliding surface. In the meantime, the technology has no restrictions on the target signal.