The invention discloses an overhead power transmission line lightning monitoring device based on snap ring power acquisition technology. The overhead power transmission line lightning monitoring device mainly comprises a snap ring power acquisition module, a lightning current detecting module, an over-voltage detecting module, a signal preprocessing module, a first wireless communication module, a control core module, a second wireless communication module, a display module, an alarm module, a GPS module and a remote control center. The overhead power transmission line lightning monitoring device based on the snap ring power acquisition technology according to the invention can realize advantages of high measurement precision, effective safety improvement and high reliability.