The invention discloses a small-size pulse bag dust collector, belongs to the technical field of dust collecting equipment, and is directed to provide a small-size pulse bag dust collector provided with a chambered offline dust removal structure. The small-size pulse bag dust collector comprises a barrel, wherein an air purification chamber of the barrel is divided into multiple small air purification cavities by chamber dividing clapboards, a sealing cover plate is arranged in each small air purification cavity, each sealing cover plate is provided with a negative pressure air hole, and the other end of each small air purification cavity is communicated with an air outlet through the negative pressure air hole and an exhaust passage in sequence; a filter bag is arranged in each small air purification cavity, the blowing device capable of blowing air into a corresponding filter bag is arranged above a bag mouth of each filter bag, and the blowing device is positioned below the sealing cover plate and is connected with an air source through a blowing pipe; and a top plate of the barrel is provided with an air cylinder at a position corresponding to each filter bag, and an output shaft of the air cylinder is connected with an air hole press plate which can plug a corresponding negative pressure air hole. The small-size pulse bag dust collector disclosed by the invention is suitable for bag dust collectors.