Thermal sensitive type drop water meter and drop water measuring method

The invention relates to a thermal sensitive type drop water meter. The thermal sensitive type drop water meter consists of an impeller type water meter base meter and a thermal sensitive type drip flow measuring device, wherein the thermal sensitive type drip flow measuring device comprises a dial box with an air vent, an environmental temperature sensor, a fluid temperature sensor, a processor and a circuit board. The impeller type water meter base meter measures normal water flow GY of a water user, the thermal sensitive type drip flow measuring device measures water temperature TW in a water outlet pipe of the base meter and environmental temperature TO, and water processing program built in the processor and the circuit board judges and calculates drop water flow of the water user according to temperature difference TC which is equal to an absolute value of TO minus TW. The thermal sensitive type drop water meter and the drop water measuring method have the advantages that not only can the normal water flow of the water user be measured, but also the drop water flow can be measured, the structure of the water meter is simple, the water meter is economic and practical and is not influenced by water quality, and the service life is long.