A foldable stick assembly includes a foldable tube unit, a sliding handle, a push rod unit, a ratchet socket, an upper ratchet, a pawl member, a lower ratchet, and a push block. The foldable tube unit includes a handle, an upper mounting tube, a lower mounting tube, an upper pivot sleeve, and a lower pivot sleeve. The push rod unit includes a main push rod and an upper push rod. Thus, the foldable stick assembly may be used to cut and remove the weeds and to loosen the soil. In addition, the foldable stick assembly is folded easily and conveniently, so that the volume of the foldable stick assembly is reduced, thereby facilitating storage and transportation of the foldable stick assembly, and thereby decreasing the cost of assembly.