The invention relates to a production device and a preparation process of methanol alkali metal salts. The production device comprises a rectifying tower (1) and a reaction tower (3), wherein after methanol steam generated from the top of the rectifying tower (1) is compressed through at lease one steam compressor, one part of the methanol steam is introduced into a reboiler (2) to heat low-temperature materials circulated out of the bottom of the rectifying tower (1), while the other part of the methanol steam is separated by a gas-liquid separator (11) and then introduced into the reaction tower (3) to react with an alkali liquor; the steam on the top of the reaction tower (3) is introduced into the rectifying tower (1) and thereby recycled. According to the invention, the rectifying system and the reaction system are combined organically; the compressed methanol steam is utilized rationally, so that steam consumption at the rectifying stage and the reaction stage in the traditional process is greatly reduced; compared with the traditional process, the steam consumption of the production device and the preparation process per hour is more than 20% lower than that of the previous process.