To test the safety and reliability of laser radar in the continuous-wave electromagnetic environment, the electromagnetic interference effect test of laser radar under continuous-wave was operation carried out. The single line off-axis laser radar was taken as the experimental object. Through the experiment, the relationship between the sensitive frequency, sensitive frequency band, and jamming effect of laser radar in different polarization directions and the field strength of jamming signal is obtained. When the polarization direction of jamming antenna is different, the sensitive frequency and frequency band of the same laser radar are also different. And the jamming signal field strength corresponding to the jamming effect of different sensitive frequency and frequency band is also different. The greater the field strength at the same sensitive frequency, the worse the laser radar gets. Finally, the reasons for the jamming of laser radar are analyzed, which provides a basis for improving the adaptability of laser radar to the electromagnetic environment.