The invention relates to a high-power formable multi-layer composite 
bus bar for space navigation. The 
bus bar comprises a confluence positive 
bus 1, cavity insulation paste 2, a bus positive bus 
binding post 3, a cavity insulation 
assembly 4, a bus negative bus 
binding post 5, a confluence negative bus 6, an outer insulation protection cover 7, a bus negative bus installation groove 8, an insulation installation sleeve 9, a bus bar protection insulation plate 10 and a terminal insulation 
assembly 11. The confluence positive bus 1 is connected with a high-
voltage end, and is on the intermediate position, the confluence negative bus 6 is connected with a low-
voltage end (namely a direct-current zero-potential end), is U-shaped and surrounds three sides of the confluence positive bus 1, so that an 
electric field line generated after the high-
voltage end and the low-voltage end are electrified is limited in the U shape, a good 
electromagnetic compatibility effect is ensured, and comparedwith the condition that a silver-plated 
copper wire is adopted in the same 
power cable assembly, about 20% of weight and volume can be saved under the condition of the same transmission horizontal sectional area. The heat dissipation area is large, the heat dissipation capacity is high, the environment temperature rise is low, and the transmission impedance can be reduced.