The present invention provides a lawn mower comprising a battery system, a walking system and a cutter system. The lawn mower further comprises: a fault detection module, configured to detect if at least one of the battery system, walking system and cutter system has a fault； a fault determination module, configured to judge the fault level of the detected fault； and a control module, to control the current-limiting or outage of the corresponding battery system, the slowdown or stop of the walking system, as well as the slowdown or stop of the cutter system according to the fault level； compared with the prior art, the invention not only makes the fault detection more intelligent, but also the lawn mower can adjust the working state in real time according to the fault level, thereby improving the working efficiency.
