Aiming at the problem of high peak-to-average power ratio of asymmetrically clipped optical orthogonal frequency division multiplexing system applied in visible light communication, a joint scheme combining Hadamard precoding with normalized μ-law companding is proposed to reduce peak-to-average power ratio on the basis of the study of coding technology and distortion technology. The simulation results of the joint scheme demonstrate an improvement of 5.8 dB in peak-to-average power ratio suppression performance compared to Hadamard precoding alone. Additionally, compared to normalized μ-law companding, it still exhibits superior performance in terms of error rate, achieving a 2 dB optimization.