Wireless spacecraft data networks can unburden the wire problems of the spacecraft, which makes it a promising technology for spacecraft light miniaturization. To replace the peer-to-peer three-wire Low Voltage Differential Signaling cables in spacecrafts, design of a wireless spacecraft high speed data network based on Impulse Radio Ultra Wideband was proposed. The wireless communication protocol referring to the American military data bus standard MIL-STD-1553B protocol was described in detail. The communication protocol adopted the time division command response mechanism, and its physical layer, data link layer, network layer and application layer were designed to meet the requirements of the wireless spacecraft high speed data communication. The design of a demonstration of the spacecraft high speed data network was tested and verified. It is proved that the system bit error rate is less than 1010^-9. The design of the protocol IP core is flexible, reliable and scalable. 