The present invention discloses a quantizer circuit of DEM algorithm, and comprises an AD quantizer, a dynamic element matching part, a DA quantizer which corresponds to the dynamic element matching part, a comparator and a controller; wherein, the comparator is used for comparing the output value K of the AD quantizer and 2/n, and then notifying the controller; wherein, N is the bit number of the AD quantizer and the DA quantizer; n is an integer which is more than or equal to 2; the controller is used for completing the charging and discharging calculation of the feedback capacitance of the corresponding DA quantizer through the dynamic element matching part, according to the comparison results of the comparator. Based on the correct shaping of the nonlinear error of the quantizers with the DEM algorithm, the quantizer circuit effectively reduces the number of repeated units in the previous DEM algorithm, lowers the structural complexity, saves the circuit area, and decreases the costs.