The invention relates to a capacitor array type digital to analog converter circuit of a high-speed successive approximation type analog to digital converter. The capacitor array type digital to analog converter circuit comprises a switching capacitor array of a full differential non-binary weight, the input end of the switching capacitor array is respectively connected to an input signal VIP, an input signal VIN, a reference high level VREFT and a reference low level VREFB, the output end of the switching capacitor array is connected with the input end of a dynamic comparator through a sampling switch, the output end of the dynamic comparator outputs a comparison result signal Yi to the input end of a switch control logic generating circuit, and the output end of the switch control logic generating circuit outputs a plurality of switch control signals to the switching capacitor array of the full differential non-binary weight. The capacitor array unit of the capacitor array type digital to analog converter circuit provided by the invention adopts a C-2C capacitor structure, and the total input capacitance under a sampling mode is a fixed constant value, so that the design of an input voltage buffer is simplified, and meanwhile the bandwidth of the input signals is expanded; the driving capacity of a differential reference circuit is greatly reduced, and thus the power consumption of the reference circuit is reduce to achieve the low power consumption demand of the entire circuit system.