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In view of the low precision and scalability of synchronization protocol for the large-scale wireless sensor networks (WSNs), clock self-synchronization protocol based on distributed diffusion (DDCSS) is proposed in this paper. The distributed diffusion-based protocol is full localized. Its implementations process is fully localized and parallel. According to the energy, distribution and the average transmission delay of nodes, DDCSS dynamic chooses a set of master node and diffusion nodes which are used to perform local diffusion in each round. And then the average clock in master node field is spread to surrounding nodes of hops. After that the surrounding nodes update the local clock by receiving the average clock. Eventually through several rounds of elections master nodes and diffusion nodes, networks implement mutual diffusion and the node clock is approximate synchronization the average clock of network nodes. By comparing DDCSS with RBS and TPSN,we show that, with the increasing of scale of sensor networks, DDSCC can synchronize the network quickly with good precision convergence speed and scalability, which appropriates for large-scale WSNs. 