The invention discloses an adjustable belt distributor. The adjustable belt distributor includes brackets erected on both sides of a belt, a material distribution platform located over the belt, and acontrol system, and a main body adjusting mechanism and a limiting device are installed on the material distribution platform; an angle required for scraping shifting rotation is calculated accordingto the desired material distribution adjustment proportion, according to the angle required for scraping shifting rotation, parameters are set on the set control system, a pulse signal is output through a PLC and is transmitted to a drive servo motor, a rotating shaft of the drive servo motor rotates at a specified angle according to the pulse number, and the angle required for material distribution scraping shifting rotation is driven at the inherent transmission ratio of the mechanism through a worm and a worm wheel; the structure is practical and reliable; accurate adjustment material distribution is conducted according to the required proportion through materials on the belt, and accuracy is high; and the adjustable belt distributor can be widely applied to a material distribution system of a belt conveying project.