The invention provides a LDPC code construction method capable of eliminating short cycles. The method comprises the steps of: selecting a column, where the biggest power Ms of a monomial expression in a spatial domain check matrix H is, and taking the column as the first column of a newly designed check matrix H; circularly moving up the first column of the matrix H for one bit, and taking the moved column as the second column of the matrix H; copying the second column of the matrix H, subtracting the power of each monomial expression by the biggest power Ms, and taking the obtained column as the third column of the matrix H; and, for all unselected column vectors in the matrix H, repeating the above three steps, and continuously adding the columns of the matrix H till the number of the columns of the matrix H is up to k. By means of the LDPC code construction method capable of eliminating the short cycles provided by the invention, the number of the short cycles in the original LDPC code can be effectively eliminated; in a Gaussian white noise channel environment, a simulation result shows that the bit error rate of decoding can be effectively increased based on the LDPC code constructed in the invention; and in addition, because the coding constraint length is not changed, the coding and decoding complexity cannot be increased in the method of the invention.