The invention relates to a preparation method for sodium ethoxide. The prepared sodium ethoxide is mainly applied to the field of industrial production of medicines and pesticides. The ball milling method for preparation of the sodium ethoxide is characterized by comprising the following steps: 1) preparing absolute ethyl alcohol and sodium hydroxide according to a mol ratio of 5: 1, placing the prepared raw materials in a stirring ball mill, preparing small spheres according to a ball-material mass ratio of 10: 1, allowing water in a cooling jacket of the stirring ball mill to flow and starting the stirring ball mill; 2) after ball milling for 5 h, introducing a product out of the stirring ball mill via a circulating pump, allowing the product to flow into a de-watering apparatus and removing water produced in the process of ball milling; and 3) filtering the dewatered product with a filtering apparatus and washing the product with absolute ethyl alcohol so as to obtain a sodium ethoxide solution. Compared with traditional preparation methods, the ball milling method provided by the invention is simple to operate (i.e., the preparation process is simple), safe (i.e., the preparation process is safe and pollution-free) and high in production efficiency.