Aiming at the problem that the underwater small platform cannot locate the low-frequency near-field target, a cooperative localization algorithm using multiple vector hydrophones was proposed. The hydrophones were regarded as different observation points, and then the azimuth angles of target connected to different observation points were estimated respectively on the basis of the array manifold characteristics of hydrophones. According to these azimuths, the location of near-field target was realized by using the orthogonal vector method. This algorithm avoids the multi-dimensional search process and reduces the calculation. The simulation results show that this algorithm can locate the nearfield target accurately and improve the location accuracy effectively.