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In the measurement of seepage in rock and soil, the osmotic pressure meter is mainly used to measure the infiltration water pressure inside rock and soil, and then the seepage monitoring is performed. The measurement is scalar, and there is a poor dynamic response, small range, nonDirect measurement and other defects are difficult to meet the needs of monitoring and development of seepage in rock and soil; in view of this, a remote online flow meter based on the principle of thermal diffusion is designed; it consists of power module, temperature detection module, constant power heating module, and display module. Three-wire platinum resistance constant current source temperature measurement circuit detects the temperature difference between the two ends of the influent water, the test results are returned to the display to the stm32 and passed through RS485 to the host for data analysis; experimental results show that the flow meter can be implemented on-line monitoring The seepage in rock and soil can effectively detect the velocity of seepage in rock and soil, with a resolution of 0.05ml/s. Thermal percolation meter has good sensitivity, accuracy and repeatability, and is suitable for the seepage measurement of most types of rock and soil.