a box body for feeding predatory mites, a box cover and at least one feeding rack, wherein the top edge of the box body is provided with a water tank surrounding the box body; the main body of the feeding rack consists of a mesh flat plate and climbing branches; the climbing branches are arranged around the mesh flat plate and extend horizontally outward until contacting with the inner wall of the box body; the bottom of the feeding rack is provided with supporting legs; and a plurality of feeding racks are stacked together;
it is not suitable to release predatory mites on rainy days or days when continuous rainfall is predicted recently.