The invention provides an analysis method and device for the voltage sensitivity in a wind power convergence area. The analysis method includes the following steps: establishing a flow equation according to a reactive exchange relationship between a static synchronous compensator and a wind power convergence system; establishing a second flow equation according to the flow equation when all funs of a wind power convergence system operate at a constant power factor and outputted active power is constant; acquiring the first reactive voltage sensitivity, the first electrical susceptance voltage sensitivity, the second reactive voltage sensitivity, and the second electrical susceptance voltage sensitivity according to the second flow equation; generating a first relation and a second relation according to the first electrical susceptance voltage sensitivity and the second electrical susceptance voltage sensitivity; acquiring a first relationship between the reactive current I, the capacitance Bc, and the equivalent impedance X and the enlargement of voltage-reactive sensitivity according to the first relation; acquiring a second relationship between an admittance value BL, the capacitance Bc, and the equivalent impedance X and the enlargement of the voltage-reactive sensitivity according to the second relationship.