The application relates to the technical field of
quartz sand screening, in particular to a
quartz sand automatic screening device and method thereof, which comprises a fixing frame, a vibrating frame, two vibrating screens, an outlet and a
discharge hopper. The vibrating frame is arranged on the fixing frame through a plurality of elastic members. The two vibrating screens are stacked on the vibrating frame in sequence. Each vibrating screen comprises an outer frame body, a screen mesh, an outlet and a
discharge hopper. The screen mesh is fixed on the inner ring of the outer frame body. The outlet is arranged on the outer frame body. The
discharge hopper is fixed on the outer circumferential surface of the outer frame body and is arranged opposite to the outlet. A through hole is arranged at the middle position of the screen mesh at the upper end. Compared with the prior art, the eccentric wheel is designed to make the vibrating screen vibrate in the vertical direction, which helps the
quartz sand to be uniformly distributed on the screen mesh and avoids the sliding of the quartz sand to the edge of the screen mesh, which helps to separate the particles of different sizes and improves the screening precision and efficiency.