In the micro capacitance detection, the traditional analog circuits exist many limitations, such as the complex design, small capacitance measurement range. To solve these problems, a micro capacitance detection system was designed. This system consists of capacitance measuring chip Pcap01, the STM32F103C8T6 minimum system, the power supply circuit and the LCD display. The software of the system, including the C program of lower computer, realizes the function of collecting the capacitance data, communicating between Pcap01AD and the MCU and converse the data. Experimental results show that the system has simple structure, high precision, small error, good stability, and strong antiinterference ability .It can be easily applied to the situations that require micro capacitive sensing, such as capacitive level sensors, etc.