Aiming at the problems of index modulation orthogonal frequency-division multiplexing technology with high peak-to-average ratio, sensitivity to phase noise and carrier frequency, and high system complexity, this paper proposes a visible OFDM-IM system based on wavelet boost transform. Firstly, the orthogonal wavelet group is selected as the subcarrier, and the signal is divided into high-frequency signal and low-frequency signal through the splitting,prediction and update of the signal, and then combined with the visible light channel to form the LWT-OFDM-IM system,and finally the reliability, peak-to-average ratio characteristics and optimal wavelet decomposition layer of the system are simulated and verified by theoretical analysis and Monte Carlo method, and the results show that when the subcarrier N=256, the number of neutron carriers in the subblock L= 4, the number of activated subcarriers k = 2,and the system bit error rate is 10-4. LWT-OFDM-IM is about 8 dB better than FFT-OFDM-IM and about 4 dB higher than DWT-OFDM-IM. When the system complementary cumulative distribution function is 10-1 orders of magnitude,the peak-average improvement of LWT-OFDM-IM is about 2. 3 dB compared with FFT-OFDM-IM. As the number of wavelet layers increases, the better the bit-error performance of the system, when the wavelet layer is 3 layers,it is about 10 dB, and the bit error rate can reach the order of 10-5.