The present invention discloses a landslide body change detection method based on a laser radar. According to the method, in a landslide disaster, especially for the change detection of a landslide body at a complex terrain, the change of position and attitude of the landslide body at a certain time period is detected automatically, once the change of a potential landslide body is detected and a change range is outlined, the field staff is reminded to pay attention and take safety measures or leave a danger zone. The method has the advantages of low cost, easy operation, fast computing, high accuracy and convenient detection, a scientific basis is provided for landslide disaster monitoring and evaluation, the security is provided for natural disaster rescue, and economic and social benefits are produced.