The invention provides an industrial production method of esomeprazole. According to the industrial production method, under the action of a phase transfer catalyst and strong alkali, omeprazole sulfur ether is prepared through condensation; through low-temperature asymmetric oxidation, the generation of nitric oxide and sulfone is reduced, an organic solution of esomeprazole (as shown in the formula III) is prepared, the organic solution can be directly fed into a sodium alcoholate solution, three steps namely asymmetric oxidation aftertreatment, salting and crystallization and refining are completed once, a finished esomeprazole product is prepared in multiple batches, the purity of the finished esomeprazole product is greater than 99.8%, the isomer of the finished esomeprazole product is less than 0.05%, the individual impurity of the finished esomeprazole product is less than 0.1%, and the medicine grade raw material medicine requirements are met. By adopting the preparation method, the step of extracting and purifying esomeprazole and esomeprazole sodium is canceled, the production period is shortened, the production cost is greatly reduced, the possibility that the sulfone impurity is increased in the production process is avoided, the preparation method is safe and reliable, simple and easy to operate, stable in salting and good in repeatability, and the product quality is greatly improved.