The invention relates to a method for coding low-density parity check code of multi-code length and multi-code rate, in particular to an extended code taking the low-density parity check code with the code length of 2032 bits and the code rate of 1/2 as core and a high-efficiency coding method for correcting channel error data, belonging to the technical field of communication channel coding. The method comprises the following steps of: firstly pre-processing an information sequence with the length of KC bit and leading the information sequence length to be 1062 bits; establishing a check matrix H; calculating the checking sequence according to the information sequence and the check matrix H; synthesizing the information sequence S and the check matrix P to obtain the code sequence with the code length of 2032 bits and code rate of 1/2; and deleting and superposing the code sequence, processing the operated code sequence, thus obtaining the code sequence with the code length of NC. The coding method has the advantages of no loss on bit error code performance, more excellent error code performance at local points, extremely low realization complexity, being extremely beneficial to hardware realization, and having extremely strong application prospect.