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In order to improve the underwater acoustic target strength of cer reflectors, according to the principle of acoustic impedance mismatch of the boundary layer, the method of using air cavity to in-crease the underwater acoustic target strength of cer reflectors is proposed. The acoustic reflection coefficients of underwater air layer and single layer metal sheet are calculated and compared. The results show that the reflection coefficient of single layer metal sheet is greatly affected by frequency and incidence angle, and the reflection coefficient of air layer in water is large and little affected by frequency and incidence angle. On this basis, a new kind of airfilled cavity cer reflector is designed. The acoustic scattering characteristics of underwater airfilled cavity cer reflector are calculated cumulatively, and the results are compared with the monolayer metal sheet cer reflector. The simulation results show that the acoustic reflection effect of the airfilled cavity cer reflector is better. In order to verify the correctness of the method, the test was carried out in the silencing tank. The experimental results show that the simulation results are in good agreement with the experimental results, and the airfilled cavity can improve on acoustic reflection performance of the underwater cer reflector.