The invention provides a control system quantizer in a wireless control device and a quantization feedback control method of the control system quantizer, relating to the technical field of the quantization feedback control of the wireless control device. The quantizer comprises a system state resolver, a signal A-D converter, an embedded microprocessor and a wireless communication circuit which are connected in sequence, wherein the system state resolver is used for acquiring a system state resolving amount based on a singular value of a system matrix; the signal A-D converter is used for carrying out digital conversion on the system state resolving amount; the embedded microprocessor is used for carrying out singular value resolving on the singular value of the system matrix, giving outan information rate optimal allocation strategy, calculating quantization parameters and carrying out quantization; and the wireless communication circuit is used for carrying out source encoding andchannel coding on a quantization value, transferring the quantization value to a system state estimator for valuation and inputting an estimated value into the controller so as to realize quantizationfeedback control. According to the control system quantizer, the quantization feedback control of the system can be realized, and the minimization of required information rate can be realized on thepremise that the control performance of the system is guaranteed.