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In view of the weakness of the existing ultrasonic gas flowmeter, this paper adopts the measuring principle of time difference method and designs the flow detection system based on MAX35104. In order to improve the measurement accuracy, the MAX35104, a new type of high-precision time-to-digital converter, is used as the core of timing measurement. The Z installation method is adopted to measure the time difference between upstream and the downstream. In order to achieve low power consumption, the ultra-low power microcontroller STM32F103 is used as the control core of the system to realize data processing and result display. This paper describes the method of MAX35104 time interval measurement, the principle of edge detection and the corresponding hardware measurement circuit implementation. The results show that the accuracy of the ultrasonic gas flowmeter flowmeter can reach the 1 level requirements of the industry standard.