The invention discloses a green preventing and control method for tobacco diseases and insect pests. The green preventing and control method comprises the following steps of (1) soil improving and sanitation of a tobacco land; (2) nitrogen control and densifying of the tobacco land; (3) propagation and releasing of aphidius gifuensis; (4) arranging of an insect trapper on the tobacco land; (5) spraying of biological pesticide. The green preventing and control method has the advantages that by combining the technical means of improving soil of the tobacco land, performing nitrogen control and densifying technologies on the tobacco land, releasing the aphidius gifuensis, arranging the insect trapper, and spraying the biological pesticide, the green preventing and control purpose on the diseases and the insect pests is realized in the tobacco planting process, the usage amount of chemical pesticide is greatly reduced, the influence to the quality of tobacco leaves by the chemical pesticide is reduced, and the pollution to environment is reduced.