The invention discloses an ultra-low-capacity liquid preparation containing thiamethoxam, which uses thiamethoxam, or the compound of thiamethoxam and active component II as the active ingredient, and supplements the rest to 100% with auxiliary agents and solvents. Low-volume liquid preparation; active component II is beta-cypermethrin, pymetrozine, chlorantraniliprole, flubendiamide, tofenpyrad, azadirachtin, buprofezin, abamectin, and emamectin Any one of plain benzoate and diazinon. The invention can be used to control crop pests such as rice planthopper, rice leaf roller, brown planthopper, white-backed planthopper, striatellus striatellus, stem borer and rice thrips, and has the advantages of convenient processing, water saving, high work efficiency and good drug effect , long-lasting, synergistic and other advantages.