The invention discloses a method for realizing AMR-WB (adaptive multi-rate wideband) voice coding or decoding by adopting an information hiding technology, capable of reducing coding parameter length and saving voice transmission bandwidth. The AMR-WB voice coder comprises a linear prediction (LPC) analysis module, a fundamental tone search module and a fixed codebook search module (comprising aninformation hiding sub module). The method comprises the following steps of: (1) extracting ISF (information system finishing) parameter coding by virtue of an LPC analysis module according to a coding rate mode, and dividing the parameter coding into hidden information ST to be embedded in a step (2); and (2) searching a second best codebook according with constraint conditions (I) in a local codebook space by adopting a first depth tree search algorithm by virtue of the fixed codebook search module, and embedding the ST into a fixed codebook index to be transmitted, wherein T is a number ofa codebook track and is selected from a codebook track 0, a codebook track 1, a codebook track 2 and a codebook track 3; ST is ISF index information to be embedded in a codebook track T; NT is the number of nonzero pulses contained in the codebook track T; PTk is the kth pulse in the codebook track T; and M is an embedded bit control bit, and log2M is maximum bit number of embeddable information in each track. By applying the method, the coding speed is reduced, the resource utilization factor is improved, the method is simple and feasible, and no additional computation complexity is increased.