Regarding the problem that the magnetic target single-point location method based on magnetic gradient tensor is greatly influenced by the estimation error of geomagnetic field, a magnetic target location method based on a cube array is proposed.This method uses the measurement information of magnetic gradient tensor of the upper and lower planes of the cube array to establish the equations about the target location, uses the characteristic of small geomagnetic gradient to eliminate the interference of geomagnetic field by making a difference in the magnetic field vector term, and then uses the difference of magnetic field vector and the information of magnetic gradient tensor to solve the position coordinates of the target.The simulation results show that the method can overcome the problem greatly influenced by the estimation error of geomagnetic field in existing methods, and improve the target locating accuracy.