Humans are frequently driving with different emotions, but how driving affects human's brain information processing mechanism in different emotional states is still unknown. In this study, we investigate the effects of driving on brain functional connectivity networks across different emotions based on electroencephalography (EEG) signals. We utilize phase lag index (PLI) to measure the degree of phase synchronization among electrode channels, and visualize the functional connectivity networks. We also employe graph theory to analyze the functional connectivity networks. Our findings indicate that the strength of functional connectivity among brain regions under different emotions significantly increased after involving in driving, with more efficient and rapid information transmission in the functional connectivity networks. This enhancement is particularly evident in the frontal and parietal lobes, with 507 enhanced connections related with the frontal lobe and 300 related with the parietal lobe, accounting for 41.94% and 24.81% of the total enhanced connections, respectively. These results offer valuable insights into the understanding of how human drives, holding potential for the development of interventions and technologies to improve emotional regulation and driving safety technologies.