The invention discloses a square brick roller pressing device for a passing building, which comprises a shell, a charging opening, a discharging opening, a crankshaft reciprocating mechanism and a first hydraulic device; a support base is arranged on the bottom of the shell, the charging opening is communicated with a drying room by the shell, drying rollers are connected by a transmission belt, the discharging opening is communicated with the drying room, a conveyor belt is fixed on the shell, the upper end of the crankshaft reciprocating mechanism is connected to a motor, a sliding block is fixed on a sliding rod, the sliding block is fixedly provided with a hammer plate, the first hydraulic device is provided with a flattening plate, a pull door is mounted on a flattening box, and a push-out plate is located on a second hydraulic device. The briquetting device for powder raw materials removes water content on the surface of the raw materials by the drying rollers, and the hammer plate is driven by the crankshaft reciprocating mechanism to repeatedly flatten structures on the conveyor belt, such that the briquetted raw materials will not be loosed, the briquetting effect is good, and meanwhile, the working efficiency is greatly improved.