The invention discloses a supporting device for an LED lamp. The device comprises a base and a rotating seat, the rotating seat is arranged above the base, a sliding rail is fixedly installed on the upper surface, close to the edge, of the base, a sliding seat is fixedly mounted on the lower surface, close to the edge, of the rotating seat, and supporting seats are fixedly mounted on the upper surface, close to two sides, of the rotating seat, a connecting column is connected into the supporting seats in a penetrating mode, an angle adjusting disc is connected to one end of the connecting column, an abutting column is connected to the other end of the connecting column in a penetrating mode, a telescopic spring is connected between the abutting column and the connecting column, an abuttingblock is connected to the end of the abutting column, and an LED lamp body is arranged on the inner side of the abutting block. According to the supporting device for the LED lamp, a heat dissipationeffect on the bottom of the LED lamp can be achieved, spraying can be conducted while the supporting device rotates, and the functionality of the supporting device is improved.