The invention discloses a method and device of automatically paving wall body mosaic pattern by utilizing small tiles. The device comprises a moving roller, a base plate, a laser distance measuring positioning indicator, an eccentric vibration pneumatic sucking disc, an X-axis motion platform, a large power stepping motor, a cement slurry sprayer, a tooth form synchronous belt, an upright, a beam slide table, a tile sorting feeder, a hand-hold box controller, a human-computer interface, a Z-axis motion platform, a mechanical arm, a double-shaft air cylinder and a clamp; a mechanical arm base is installed on the Z-axis motion platform, the mechanical arm is installed on the mechanical arm base, and the clamp is installed on the double-shaft air cylinder; the laser distance measuring positioning indicator, the eccentric vibration pneumatic sucking disc, the tile sorting feeder and the cement slurry sprayer are stored on the base plate side by side, and option keys of a manual control mode and a procedure control mode are installed on the hand-hold box controller. Compared with traditional manual tile paving, the method and device of automatically paving the wall body mosaic pattern by utilizing the small tiles has the effects that paving efficiency is high, the labor intensity is reduced, and labor cost is remarkably reduced.