The invention relates to a plant activate fluid which comprises organic acids, alcohol, phosphoryl compounds, phenols, a small amount of inorganic matter and water. According to weight percentage, the organic components comprise 48 percent to 55 percent of acetic acid, 0.9 percent to 4.0 percent of formic acid, 0.8 percent to 3.1 percent of propionic acid, 0.04 percent to 0.08 percent of valeric acid, 0.46 percent to 0.8 percent of butylric acid, 0.04 percent to 0.2 percent of crotonic acid, 0.9 percent to 2.1 percent of methanol and 1.8 percent to 2.4 percent of acetaldehyde; and the organic components further comprise 0.3 percent to 1.6 percent of pyridine, 1.6 percent to 3.2 percent of furan, 0.83 percent to 1.87 percent of phenol, 0. 4 percent to 1.6 percent of 2-furfural alcohol, 1.2 percent to 2.9 percent of 2(3H)2 hydrogen furanone, 1.6 percent to 2.8 percent of 2(5H)2 hydrogen furanone, 0.09 percent to 0.32 percent of tetrahydrofuran, 0.1 percent to 1.5 percent of 2-tetrahydrofurfuryl alcohol, 0.89 percent to 2.1 percent of furfurol, 0.3 percent to 1.7 percent of methyl acetate and 0.2 percent to 1.5 percent of hydroxy methyl acetate. The invention takes branch and leaf wastes of ligneous plants as the raw material for carbonization, the smoke is collected during the carbonization process, and the plant activate fluid is obtained through water-cooling, temperature reduction and condensation.