The invention discloses a method for capturing a self-adapting threshold of an anti-multichannel interference PN code in the technical field of communication, which comprises the following steps: firstly constructing a two-way parallel digital matched filter, achieving correlative operation of a spread-spectrum signal and a local PN code, then summing two-way correlative values after being squared, and obtaining synchronously verified decision statistic of the PN code after taking a square root. The method is characterized in that the statistic is added to a sequence converting circuit and aninput end of a median filter simultaneously, the statistic output by the sequence converting circuit is processed by a two-way parallel form filter and then output values are summed, a mean value is taken to obtain a self-adapting judgment threshold, a judging device compares the judgment statistic with an input self-adapting judgment threshold till the judgment amount is larger than a threshold value, and capture of the PN code is decided to be successful at this moment. The method has the advantages that the method can adapt to a multichannel environment better, has excellent performance ofanti-multichannel interference, has strong practicability, and can be applied to various mobile communication systems using direct sequence spread-spectrum technique.