The invention discloses a lifting device of a lamp. The lifting device comprises a holder, a pulling rod, a resetting spring, components, two levers, and a wire rope, wherein the holder comprises a support plate and two support pins, guide holes are arranged on the support plate and said two support pins are vertically fixed to one side of the support plate; the pulling rod comprises a rod body and two blocking flanges respectively fixed to two opposite ends of the rod body, the rod body passes through the guide holes, and said two blocking flanges are respectively arranged on two opposite sides of the support plate; both ends of the resetting spring are respectively fixedly connected with the holder and the pulling rod; the components are fixedly connected with the pulling rod and arranged on one side including the support pins; the middle parts of said two levers are respectively rotationally connected with said two support pins, one end of each lever is respectively clamped with the clamping slot of the lamp, the other end of each lever is rotationally connected with the components, and said two levers can slide with respect to the components or the supports; one end of the wire rope is fixedly connected with the pulling rod while the other end of the wire rope is used as the wire rope fixedly connected with the lamp. According to the lifting device, the lamp can be continuously lifted when the wire rope accidentally disconnects, thus the lifting device is relatively safe.