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A special synchronized cable is needed to achieve the synchronization of the signals between the emitter and the receiver in conventional light curtain. Aiming at this shortcoming, this paper presents a new synchronization method for the high speed light curtain, namely that an optical pulse train as the frame synchronization code is added before the first channel emitted optical pulse in each cycle period of the emitter, and the synchronization of the send and receive signals at the receiver is achieved by decoding the frame synchronization code. Furthermore, a system scheme implemented by utilizing FPGA technique is provided. The practical application shows that the light curtain detector with this method is stable and reliable and its capture and synchronization performance is excellent.