For the problems of complicated structure, difficults to networking and low accuracy of traditional acoustic emission localization system, an acoustic emission localization based on fiber Bragg grating (FBG) sensor network and time reversal focusing imaging technology is designed. Based on the analysis of the principle of time reversal focusing, positioning system by four FBG sensors is built and narrow band laser edge filter technology is used to realize signal demodulation. Morlet wavelet transform is used to extract specific frequency component signal, and calculate the modulus value and time lag. Through the establishment of time reversal focusing model, acoustic emission location is realized. The localization method is verified in the aluminum alloy plate. The experimental result shows that this method can effectively realize localization and imaging of acoustic emission source, and localization error is less than 20 mm, and time consumption is less than 2 s. A new method is provided for acoustic emission detection and localization.