The invention relates to the field of agricultural weeding machinery, in particular to a weeding device for crop planting and a using method thereof. The weeding device comprises a driving box fixed on a rack and further comprises a hanging plate and a hanging rack, a fixed shaft on the hanging plate is rotatably connected with a second chain wheel, a first chain wheel is fixed at an output shaftend of the driving box and connected with the second chain wheel through a chain, the second chain wheel and corresponding rotating rings are fixedly connected through multiple cross rods, a soil excavating mechanism is fixed on the cross rods, screen drums are fixed on two sides of the hanging rack, two press plates are slidably connected in each screen drum, a pull rod is fixed at a center of one face, facing the second chain wheel, of each press plate, and the end, positioned on the outer side of the second chain wheel, of each pull rod is connected with the chain through a first connectionrod. The soil excavating mechanism is utilized to excavate soil and weed together into the screen drums, and the press plates are utilized to crush the weed and the soil, so that weeding effect is improved, soil ventilation is facilitated to prevent caking, and crop growth is benefitted.