The performance of metamaterial absorbers will be affected by the incident angle of electromagnetic waves. It is difficult to design incidence angle-insensitive metamaterial absorbers. This paper proposed metamaterial absorbers with wide-angle incidence based on equivalent medium theory. The absorber unit consists of a double-sided split resonant ring placed vertically on the ground. Resistors and capacitors are loaded at the opening of the resonant ring. The resistor is used to adjust the equivalent electromagnetic parameters of the metamaterial. Besides, the capacitor is used to control the resonant frequency of the metamaterial and for the purpose of miniaturization of the unit. While the transverse electric (TE) plane wave impinging on the surface of the absorbers, R=4000 Ohm, C=1.5 pF, the proposed absorber could achieve greater than 90% at 1.59 GHz up to a 70° incidence angle. Besides, the absorber could achieve 85% absorptivity under 75°. While the transverse magnetic (TM) plane wave impinging on the surface of the absorbers, R=1200 Ohm, C=1.5 pF, the proposed absorber could achieve greater than 90% at 1.59 GHz up to a 70°incidence angle. Besides, the absorber could also achieve 85% absorptivity up to 75°. The results show that the measurement results are basically consistent with the simulation results. In addition, when the capacitance is changed while the other parameters maintain unchanged, the metamaterial absorber proposed in this paper still has the same wide-angle absorbing performance at the new resonant frequency. In other words, the proposed absorber has broadband operating characteristics.