An exemplary rotatable joint (100) includes a socket (10), a rotatable arm (20), and a connecting device (30) configured for being mounted in the socket. The connecting device includes a sub-socket (31), two elastic sleeves (33), and two pivot shafts (35) fixed to the socket. The sub-socket includes a first half (311) and a second half (312). A pivot hole (315, 316) is defined in each of the first half and the second half for engaging with an outer surface (331) of one of the elastic sleeves. An outer surface (351) of each of the pivot shafts engages with an inner surface (332) of one of the elastic sleeves. A through hole (317) is defined in the sub-socket for rotatably engaging with the rotatable arm. Each of the elastic sleeves abuts the rotatable arm.