The invention provides a NLOS positioning error elimination method based on the Ad-hoc wireless network technique, comprising: firstly measuring a signal arrival time sequence of awaiting positioning mobile phone users on base station end; then converting the arrival time sequence into an arrival distance sequence and processing to fit the arrival distance sequence to gain mean square deviation of a fitting sequence related to the arrival distance sequence to process comparison with system noise covariance; determining signal transmission state between the base station and the awaiting mobilephone. If the transmission state is determined NLOS, a certain number of relay mobile phones are chosen and measured to gain the arrival time sequence between the relay mobile phone and the awaiting positioning mobile phone and the arrival time sequence which comprises NLOS errors and is measured on the base station end is instead of to process to position. Least-squares solution of the positionsof the awaiting positioning mobile phone users is gained via a positioning arithmetic based on data fusion. The invention can effectively eliminate time delay errors caused by NLOS transmission, and have lower dependency degree for a statistical model of NLOS errors and high positioning accuracy.