[Purposes] To solve the radar stealth problem, a 1-bit coding metasurface array with dynamic scattering characteristics was designed, which could realize the wideband reduction of radar cross section (RCS). [Methods] The coding sequences of various metasurfaces were obtained quickly by using the random coding method, and the simulation errors caused by different coding sequences were avoided when the same algorithm was used. The array was composed of two kinds of elements with a pinwheel shape on the upper layer patch. By controlling the ON/OFF state of the PIN diode, the conversion between elements “0” and “1” was realized. The RCS of the antenna was effectively reduced by the non-periodic random coding of the two elements, which made the reflection pattern of the array appear diffuse scattering. [Findings] The simulation results show that the RCS reduction of the three random coding metasurfaces is greater than 8 dB, and the maximum reduction can reach 18.8 dB in the frequency band of 8.2~13.2 GHz (relative bandwidth is 46.7%) when the x-polarized wave is vertically incident. [Conclusions] The coding metasurface array proposed in this paper can effectively achieve RCS reduction and has a wide application prospect in radar stealth technology.