Abstract: The laser has a very high radiant energy flow, excellent monochromaticity and excellent directionality. Through the study of the biological effects of plants, it was found that a suitable dose of laser could improve the photosynthetic efficiency of plants, promote plant growth and development, and solve the problems such as insufficient lighting on plants and the lack of light in certain bands, etc. The biological effects of laser on plants as well as the research progress of laser lamps in modern agricultural applications and the prospects for the future research were expounded.