The utility model discloses an anti-backflow precise electronic vacuum gauge. The device comprises a power supply, a pirani vacuum sensor, an operational amplifier, an A/D conversion circuit, an EPROMmemory, a processor, a liquid crystal display and a digital control and interface circuit. The power supply is used for supplying power to the pirani vacuum sensor, the operational amplifier, the A/Dconversion circuit and the digital control and interface circuit; wherein the digital control and interface circuit is respectively connected with the A/D conversion circuit, the EPROM memory, the processor and the liquid crystal display, and the A/D conversion circuit is also connected with the pirani vacuum sensor through the operational amplifier. According to the utility model, the vacuum degree can be accurately measured, the potential safety hazard of the McLeod vacuum gauge is eliminated, the liquid crystal screen is adopted for display, the visual effect is good, and the falling resistance is strong.