The invention relates to a main and auxiliary cooperative control device and a main and auxiliary cooperative control method for a wind power plant static reactive power compensator. The method comprises the following steps: an input circuit inputs VN into a comparison circuit and a voltage regulation circuit, and inputs a static reactive power compensator inductive branch current to a reactive power regulation circuit; the comparison circuit compares VN with main and auxiliary control switching upper and lower limit voltage values Vmin and Vmax; if Vmin