Anhui Jinli lightning early warning system adopts field grinding electric field meter, which is a highly centralized software and hardware system integrating atmospheric electric field intensity monitoring and lightning near-warning. The field grinding lightning early warning system adopts DC brushless motor to It rotates at a uniform speed to realize the switching between shielding and non-shielding of the stator. The stator is an electric field induction surface, so as to obtain a changing current signal (Q=ε*S*E). It uses the measured electric field, electric field change rate, electric field mean value three Method technology can achieve 0% false alarm rate. The truth of the field grinding probe is: the anti-interference ability is relatively strong, the collected electric field value data is accurate and stable, and it can achieve early warning even if the first lightning occurs locally.