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In order to improve the accuracy of optical fiber line state prediction in power communication system, a power optical fiber line state prediction model (FA-ARIMA-GRU) optimized based on improved firefly algorithm (FA) algorithm is proposed. Firstly, aiming at the problems of premature convergence and low optimization accuracy of FA optimization, the overall distance is exponentially weighted average, the iterative attenuation step factor is designed, and the deviation correction is considered to improve the problems of FA; Secondly, the improved FA is used to optimize the input parameters of ARIMA-GRU optical power prediction model, so as to improve the accuracy of the input parameters of ARIMA-GRU prediction model to a certain extent; Finally, the effect of fa-arima-gru prediction model is verified through simulation test. The results show that FA-ARIMA-GRU prediction model has better prediction effect, accurately predict the optical power value, master the line state of power optical fiber in advance, predict optical fiber line faults, effectively avoid faults and ensure smooth and uninterrupted power communication transmission.