The problem of the synchronization for discrete uncertain spatiotemporal networks based on sliding mode control is discussed. At first, an effective network sliding mode surface and a network synchronization controller are designed. From this, the stability condition of the sliding surface is derived. Further the stability condition is used to determine the range of adjustment parameters in the sliding surface, and the recognition law of unknown parameters is designed. And then, the unknown parameters in the sliding surface are identified effectively. At last, the spatiotemporal network with the actual electro-optical spatiotemporal chaos model is constructed. And the feasibility of the synchronization scheme and the effectiveness of the controller are verified by simulation. The proposed synchronization technology allows the topology of the network to be arbitrary, and this synchronization scheme does not need to design Lyapunov functions. The network synchronization can be realized by adjusting the parameters in the sliding surface.