A receiving device includes a casing, a guiding member, a rotation member, a key, and a pushrod. The casing includes a baseboard, a first side plate, a second side plate, and a receiving member. The guiding member is received in the receiving member and defines a receiving groove. The rotation member rotatably covers the receiving groove and defines a bump element. The bump element is mounted on the first side plate through a first spring. The key is movably arranged in the casing. The pushrod includes a first end, a second end, and a spindle. The key is driven by an external force to drive the pushrod to rotate about the spindle, and the pushrod drives the rotation member to rotate until the receiving groove is no longer covered, thus the receiving groove is opened.