The main chemical and sanitary indicators of waste formed during the cultivation of the fly Hermetia illucens were determined. The compliance of chemical and sanitary indicators with the requirements for waste for their use in agriculture is shown. Various methods for preparing a phytostimulator have been tested, the simplest and most effective method has been chosen - with the help of aqueous extraction. Proposed method allows to develop non-waste technology for production of biologically active substances. Based on data on the productivity of the growing process, phenological features of the development of primarily cereal and oilseeds after treatment with a phytostimulator, it can be concluded that it is advisable to use a phytostimulator obtained from Hermetia illucens fly cultivation waste.