Supporting device for LED lamp

The supporting device for the LED lamp comprises a fixing frame and a support installed on a fixing block, a lamp holder used for installing the LED lamp is arranged on the support, the support is connected with the fixing frame through a lifting assembly, a driving motor is started to drive a screw rod to rotate, and then two first sliding blocks are driven to move on the screw rod. The support can ascend and descend through the shear fork assemblies, so that people can conveniently disassemble and assemble the LED lamp on the support, high-place operation is not needed when the LED lamp is replaced, the replacement efficiency is improved, the descending height of the lifting assembly is increased through the two shear fork assemblies to adapt to roofs of different heights, and after thetwo clamping blocks are clamped on the support, the replacement efficiency is improved. Under the action of the gravity of the lamp holder, the third connecting rod tightly abuts against the clampingblock on the support, and