The invention relates to an efficient acetamiprid insecticide. The insecticide is prepared from components in parts by mass as follows: 10-15 parts of acetamiprid, 1-20 parts of methyl oleate, 1-20 parts of an emulsifier, 1-20 parts of calcium dodecylbenzene sulfonate, 1-30 parts of white carbon black, 1-20 parts of a dispersing agent, 0.5-10 parts of a binder, 1-5 parts of talc powder, 1-5 parts of clay and 1-10 parts of a cortex phellodendri extract. The invention further provides a preparation method of the efficient acetamiprid insecticide. The efficient acetamiprid insecticide has a good insecticidal effect, and the preparation method is simple and easy to popularize.