The invention relates to a preparation method of a slow-release
pesticide. The method comprises the steps of: adsorbing a pesticidal
active compound into a porous material; using a pore channel sealing material to seal the pore channels of a porous carrier; conducting further
processing so as to obtain a suspending agent,
powder, a granule, a tablet and other products of different preparation forms. The pesticidal
active compound can be a
pesticide, a bactericide, a herbicide or a
plant-
growth regulator. The preparation method of a slow-release
pesticide in the invention can be used to prepare slow-release
powder, slow-release granules, slow-release tablets, slow-release
suspending agents and other products of different preparation forms so as to meet different demands of agricultural production, and can control the release of pesticidal
active components into a surrounding environment at a predetermined speed or a
low speed within a predetermined time. One-time application of a slow release pesticide prepared in the invention can
control diseases, pests and weeds of a whole growth period (or a certain period). Thus, the slow-release performance of pesticides can be substantially enhanced, the
release time can be prolonged, and long-time stable release of slow release pesticides can be maintained.