Aiming at the problems of consuming too much time and poor design effect in the design process of metamaterial absorbers, a genetic-particle swarm optimization mutation algorithm is proposed. The metamaterial absorber surface structure with binary coding is taken as the optimization object, and a metamaterial absorber structure with high fitness value is obtained after the optimization of the genetic-particle swarm optimization mutation algorithm. The COMSOL simulation results show that the absorbing rate of the absorber is more than 90% for normal incident electromagnetic waves in the frequency band of 9.3 to 17.4 GHz, and the absorbing bandwidth is 8.1 GHz. The design method has the characteristics of easy realization, short design time, broadband wave absorption of the wave absorber and the like, and the design difficulty of the metamaterial wave absorber is greatly reduced.