A support stand for display device includes a base seat, an elevating support, and a locking module detachably connected the elevating support to the base seat. The locking module includes a fixing member, a rotating member, an elastic member, and a latching member. The fixing member is fixed on one of the base seat and the elevating support, and the fixing member defines a gap and a latching groove. The rotating member is rotatably extended through the other one of the base seat and the elevating support, and the fixing member. The elastic member is sleeved on the rotating member, and abuts on the fixing member. The latching member is fixed on an end of the rotating member. The latching member is extended through the gap of the fixing member, and is engaged in the latching groove of the fixing member.