The invention discloses a starch cooking device. The starch cooking device comprises a reaction tank, a first pump body, a cooker and a first storage tank, wherein the reaction tank is connected with a stirrer for stirring the inside of the reaction tank; the lower part of the reaction tank, the first pump body and the lower part of the cooker are connected sequentially through a pipeline; a second switching valve is arranged on a pipeline at the upper part of the reaction tank, the pipeline passing through the second switching valve is divided into two ways to be connected with the upper part of the cooker and the first storage tank respectively; a first switching valve and a fourth switching valve are arranged on a pipeline connected with the first storage tank, a blowdown pipe is arranged on the pipeline between the first switching valve and the fourth switching valve, and a third switching valve is arranged on the blowdown pipe. The starch cooking device is initiative at home, is a focus in the industry, has considerable operability and stability and is a reference example for other industries. 5.3 million yuan is expected to be saved every year, and the device makes a great contribution to cost reduction. COD (chemical oxygen demand) emission is reduced, and pressure for later-stage water ring treatment is relieved.