The invention discloses an agricultural field quantitative watering and liquid fertilizer irrigating device based on the internet of things. The agricultural field quantitative watering and liquid fertilizer irrigating device based on the internet of things comprises a main three-way pipe, wherein a pipe orifice of the main three-way pipe is provided with a liquid fertilizer delivering pipe; and one end of the liquid fertilizer delivering pipe is provided with a liquid fertilizer storage assembly. The agricultural field quantitative watering and liquid fertilizer irrigating device based on theinternet of things is scientific and reasonable in structure and safe and convenient to use. The liquid fertilizer storage assembly is arranged, through effects of a stirring shaft, a rotating wheel,a stirring wheel and stirring blades, liquid fertilizers are convenient to stir, and are mixed uniformly, the fertilizer effect is improved, through the action of floating blocks, the liquid level condition inside a liquid fertilizer tank can be visually observed by a user, therefore, whether raw materials need to be added or not is judged, and through effects of a bearing wheel, a linkage rod, afirst belt pulley, a second belt pulley and a linkage belt, liquid in the liquid fertilizer tank is stirred automatically by converting potential energy generated by falling of the liquid into kinetic energy, the liquid in the liquid fertilizer tank is prevented from depositing, and resources are saved.