Aiming at the problem that the peak-to-average power ratio in the orthogonal frequency division multiplexing system of visible light communication is too high, this paper proposes an improved Polar codes scheme to reduce the peak-to-average power ratio. The peak-to-average ratio growth index and amendment bits are introduced into the Polar codes encoding process. First, the scheme calculates the peak-to-average ratio growth index of a large number of Polar symbols in offline form to obtain the best index of amendment. This process is realized by Monte Carlo simulation. Second, in the system transmission process, the channel matching is performed through the signal-to-noise ratio feedback information, and the optimal correction set is obtained by looking up the table. Finally, the corresponding correction bit is bit-flipped to reduce the peak-to-average ratio. This solution is able to use the traditional decoding solution of the Polar codes to jointly decode the information and amendment bits, so there is no need to transmit auxiliary information, and the complexity of the encoding and decoding process does not increase. The simulation results show that when the code length is 1024, the number of subcarriers is 256, and the number of amendment bits is selected as 32, the proposed correction scheme can reduce the peak-to-average ratio by 4.9 dB without affecting the decoding complexity, and has a smaller block error rate performance advantage compared to the same type of scheme.