The invention discloses a load balancing method for node tracking in a wireless sensor network, is applied to the field of sensor network node communication, and aims to solve the problem of excessiveconsumption of node energy in order to meet tracking conditions in the prior art. According to the invention, an extended Kalman filtering method is adopted to track unknown nodes entering a sensor network in real time; the number of movable anchor nodes is selected by setting a threshold value, an unknown node estimation position error obtained through calculation according to the number of themovable anchor nodes is close to a set precision upper limit, and an optimal anchor node moving scheme is obtained; and load balance is achieved while the precision is ensured.