Provided is a visible light communication method based on an LDPC code. The invention relates to a communication method and particularly relates to a visible light communication method. In order to solve the problems of large computational complexity and bad BER performance of a visible light communication method based on an LDPC code in the prior art, the method provided establishing a visible light communication system model at first; construing an index matrix G, taking element values in the matrix G as the circulation bits of the sub-matrix in a verification matrix H, and constructing the verification matrix H; obtaining a codon vector equation set based on a verification equation H cT=0, determining the verification vector p, and realizing rapid coding; presetting the prior probability I of information under a gauss channel, and calculating the posterior probability LQ of all of the information nodes, wherein when the LQ >0, the information bit is determined as shown in the description; and completing the coding of the LDPC code at the end. The visible light communication method is applicable to the communication field.