The invention discloses a horizontal multi-chamber boiling bed dryer. The dryer consists of a discharge hole, partition plates, an exhaust fan, a cyclone separator, a cyclic discharge pipe, a perforated plate, an air preheater, an air filter and a blower, wherein the perforated plate is provided with the partition plates according to a certain space to form a plurality of drying chambers; the space of the partition plates is adjustable; a material firstly enters the foremost drying chamber from a feed hole, sequentially moves in gaps of the partition plates and the perforated plate by means of the potential difference of the perforated plate and is finally discharged from the discharge hole of the final drying chamber; after air is heated, the air enters each drying chamber through the blower, the air filter and the air preheater to come into contact with the material to dry; waste gas carrying powder passes through the cyclone separator, so that the separated material reenters the drying chambers and the purified waste gas is discharged from the top.