Digital quantity acquisition system provided with anti-electromagnetic interference circuit

The utility model discloses a digital quantity acquisition system provided with an anti-electromagnetic interference circuit. The digital quantity acquisition system comprises a microprocessor, a USB interface power supplying circuit, a digital quantity input interface and a communication module, wherein the digital quantity input interface is connected with the microprocessor through a buffer, and the USB interface power supplying circuit includes a USB conversion module. One end of the USB conversion module is connected with the microprocessor, and the other one end of the USB conversion module is connected with an outer end through a USB interface. The digital quantity acquisition system is characterized in that the digital quantity input interface is also provided with an anti-interference module. According to the digital quantity acquisition system of the utility model, a USB power supplying mode is adopted, and the system is powered by a USB conversion chip, and therefore, the digital quantity acquisiti