A coffee filtering device includes a filtering cup, a grinding device, and a base. The filtering cup includes a first peripheral wall and a first bottom wall. First lateral filtering nets are disposed in the first peripheral wall. The first bottom wall includes a longitudinal hole and first lower filtering nets. The grinding device includes a blade unit disposed in the filtering cup and a transmission shaft coupled with the blade unit to rotate therewith. The base is disposed around the filtering cup and includes a second bottom wall connected to a lower end of a second peripheral wall which is coupled with the first peripheral wall of the filtering cup. Second lateral filtering nets are disposed in the second peripheral wall. The second bottom wall includes a longitudinal hole and second lower filtering nets. The transmission shaft extends through the longitudinal holes of the first and second bottom walls.