The invention relates to an asynchronous motor vector controller, which comprises a DSP control board, an I / O board, an optical fiber board and a conditioning plate, wherein an integrator is positioned in an asynchronous motor model observation module, consists of a feedforward part and a feedback part, and comprises an integral orthogonality detection module, an orthogonal compensation PI regulator module, a conversion module of Cartesian coordinates to polar coordinates, a conversion module of polar coordinates to Cartesian coordinates, and a flux linkage amplitude limiting module. The asynchronous motor vector controller with the integrator not only has the effects of improving a back electromotive force integral initial value and DC offset, but also solves the problem of integrationphase bias, improves the flux linkage control effect of the asynchronous motor, improves the observation precision of stator flux linkage and the stability of the motor under the rated load, and has relatively simple structure and easy implementation.