Aiming at the problems of low reliability and poor user fairness in non orthogonal multiple access visible light communication(NOMA-VLC) system based on Fourier transform optical orthogonal frequency division multiplexing(FFT-OFDM), a carrier modulation method called lifting wavelet transform(LWT) is proposed to establish a NOMA-VLC system based on LWT-OFDM. The signal processing process in the system is introduced, and an indoor space experiment environment of 5 m×5 m×3 m is constructed. The experimental results show that compared with the NOMA-VLC system based on FFT-OFDM, when the order of orthogonal amplitude modulation increases from 4 to 64, the required signal to noise ratio(SNR) value is lower, at least 4.4 dB lower, when the average bit error rate of the proposed system reaches the threshold of 3.8×10-3. User performance differences do not change significantly or even remain unchanged.