The invention discloses a semiautomatic finishing and sewing device. The semiautomatic finishing and sewing device mainly comprises a belt (1), an automatic labelling machine (2), a sewing machine (3), a closing device (4), a clamping device (5) and a blanking hole (6), wherein a material bag which is fully filled with materials is conveyed to the station of the clamping device (5) along the belt (1); during clamping and initial closing of the whole material bag, the clamping device (5) and the material bag advance along the belt (1) at the same speed; when the material bag is conveyed to the closing device (4), the mouth of the material bag is closed; meanwhile, the material bag is conveyed to the sewing machine (3) and the automatic labelling machine (2) for labeling and sewing. By adopting the semiautomatic finishing and sewing device, automatic operation on large-sized packaging lines of flour and the like from bagging to sewing can be realized, only manual auxiliary monitoring is needed, the whole process is rapid and efficient, the labor force is reduced, and the labor cost is lowered.