The present invention relates to the field of foundry and namely to a process and a device (embodiments) for preparing mold-sand. To provide a possibility to check the moisture content during the process of the mold-sand preparation and to adjust the moisture content in the considered mix batch, in the process for preparing mold-sand comprising the steps of pouring a proportioned amount of mold-sand components into a mixer, adding the calculated amount of water, mixing the components, taking a sample and measuring the mold-sand moisture content, according to the invention, after taking a representative sample from the mixer, this sample is used to make a specimen by its compaction, and the moisture content is measured with the consequent adjustment of the moisture content in the considered mix batch, and in the device for preparing mold-sand comprising a mixer under the form of a fixed pan containing mixing elements under the form of shares and of vortex heads, and an assembly for controlling the mold-sand mix moisture fixed on a wall of said pan above the level of the shares, according to the invention, the assembly for controlling the mold-sand mix moisture comprises a case for forming a specimen and fixed obliquely on the wall of the fixed pan, at one end of which a plunger with a built-in moisture probe and an air cylinder are mounted, its other open end located inside the mixer being provided with a periodically-operated butterfly valve serving to fill the case with mold-sand, with an additional air cylinder. III. 3 p.