Remote measuring method of gas leakage in buildings

The invention provides a remote measuring method of gas leakage in buildings. The remote measuring method comprises following step: A1, the height H of an unmanned aerial vehicle to the ground is measured, and the unmanned aerial vehicle is loaded with a remote measuring instrument to perform flight in a Z-shaped route, wherein when the unmanned aerial vehicle passes by the window of a same room, the projection of the route on the window comprises at least two lines, and the content of flue gas corresponding to the height H is obtained by the remove measuring instrument; and A2, the content of the flue gas corresponding to different rooms of different floors of a building is obtained based on the mapping relation of the number of floors with the height H, and the height H. The remove measuring method is accurate in detection results.