Data centers are facing dual challenges from bandwidth and energy consumption, for which optical switching is a promising solution owing to its advantages of high bandwidth, low power consumption, and transparent transmission. Considering the high energy consumption and long delay caused by the electronic buffers used in the Clos architecture, an all-optical switching architecture based on Ring-Clos is proposed. Routing between adjacent central modules is provided for optical packets by employing intra-stage connection and tunable wavelength converters, thereby solving the output port conflict problem at certain input or central modules. Meanwhile, the concurrent dispatching for Ring-Clos switch scheduling algorithm is applied to distribute routes for optical packets as it has low complexity and simple hardware implementation. The simulation results show that the packet loss rate of the proposed architecture is as low as 48.81% of that of the Clos architecture, which means the proposed architecture effectively improves the network performance.