The invention discloses an encoding method based on visible light communication. A visible light signal which is sent by a mobile phone flash light can be encoded, bit-2 signals are represented by the number of high electric levels, the high electric levels are in one-to-one correspondence with the bit-2 signals, the bit-2 signals are divided by groups, one byte is represented by four groups of bit-2 signals, and the sending cycles of the groups of signals are identical. The method has the advantages that the encoding mode is simple, and the encoded signals are stably transmitted with short delay. Besides, as the sending cycles of the groups of signals are identical, the sending time of the signals does not change due to the difference of sent signals, and the signal sending speed is high.