The utility model relates to a horizontal aluminium phosphide administration apparatus, a reaction tank [4], a water tank [7] and an air tank [15] are connected together to compose a structure whose shape likes the inverse Chinese character 'pin' through pipe joints [5, 17] and air pipes [6, 16]. The utility model has the advantages of simple structure, convenient operation, good fireproof explosionproof performance, high safety, good insect killing effect, etc. The utility model is suitable for aluminium phosphide agentia adding water to react to generate hydrogen phosphide toxic gas to have fumigation and insect disinfestation in a granary, a cigarette storehouse and a medicinal materials storehouse.