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For gas-solid fluidized bed cowl faults affecting the fluidization quality problem, this paper proposes away to detect the cowl fault location and fault type rapidly and accurately; This method uses the acoustic emission technology, by installing distribution in fluidized bed plate at the bottom of the acoustic emission sensor collection and distribution of solid particle impact in the gas-solid fluidized bed plate produced by acoustic signal, then the signal is sent to multi-scale wavelet packet decomposition, find out the characteristics of frequency and energy distribution differences; Contrast each testing point on the strength of the acoustic emission signal’ total energy can intuitive response cap fault location, observe changes in the rate of energy distribution can effectively judge the scale cap fault type, so as to realize the real-time online monitoring the fluidized bed cap damage, and have fault handling in a timely manner, improve the quality of fluidized bed fluidization.