The invention relates to the field of plant protection, and specifically relates to a colloidal artificially-improved feed used for amblyseius cucumeris population indoor-reproduction. The artificially-improved feed comprises silkworm chrysalis tissue liquid, yeast extract powder, tryptone, glucose, honey, fresh yolk, and water. The colloidal artificially-improved feed used for amblyseius cucumeris population indoor-reproduction provided by the invention is low in raw material costs, and capable of effectively facilitating indoor reproduction of the amblyseius cucumeris population; and thus, the colloidal artificially-improved feed has positive promoting effects on future scale production of predatory mites of the genus of amblyseius.