Liquid crystal elastomers (LCEs) are a kind of slightly cross-linked polymer network containing liquid crystal units, which combine the soft elasticity of polymer networks with the anisotropy of liquid crystal substrates Note that LCEs realize non-contact motion under the stimulation of external environment via using program molecular orientation, which exhibiting excellent elasticity and drive performances. These results further verify LCEs possess great potential in practical applications of artificial muscles, software robots and wearable devices. Liquid crystal elastomer fibres, as a common form of LCEs, exhibit broad application prospects in many fields due to its higher orientation of the liquid crystal substrates within the fiber, more sensitive response to various stimulation, good programmability and excellent mechanical strength. This paper reviews the main preparation methods of liquid crystal elastomer fibers, analyzes the driving response mechanism to different types of stimuli, systematically introduces the classification of photo-responsive liquid crystal elastomers, and elucidates the photothermal conversion process and the remote drive regulation mechanism. In addition, the liquid crystal elastomer fiber systems with different driving modes are analyzed, and the latest research progress in the fields of flexible sensing, intelligent driving, biomimetic, and artificial muscle of fiber-wiper LCEs composites are briefly discussed, and its development prospect is also prospected in this paper.