A solid pesticidal formulation, such as wettable powders, water dispersible granules and water soluble formulations, enveloped in a water soluble substance, such as polyvinyl alcohol and so on, wherein the solid pesticidal formulation comprises at least one water soluble hydroxy compound selected from the group consisting of alkanols, alkylene glycols, glycol monoethers, tri- or more valent alcohols, alcoholamines, hydroxyfatty acids and hydroxyfatty acid esters, or water soluble glycol ether acetates is excellent in stability after preserved.