Assembling structure and lighting device with assembling structure

A lighting device, comprising:

• a frame;
• a light source;
• and
• an assembling structure installed on the frame, comprising:
• a base installed on the frame, having a ring groove and comprising a bottom base and a limitation plate, wherein the bottom base comprises a base portion and a protruding portion, the protruding portion is disposed protrudingly on the base portion, the limitation plate is installed on a side of the protruding portion further away from the base portion for keeping a distance between the limitation plate and the base portion, so as to form the ring groove;
• an assembling body comprising at least two first fastening portions, the assembling body having an opening, the light source being installed at the opening of the assembling body;
• and
• a fastening element disposed in the ring groove and rotatably installed on the base, the fastening element comprising at least two second fastening portions, the fastening element being configured for rotating relative to the base, the fastening element having a fastening position and a releasing position, wherein when the fastening element is at the fastening position, the two first fastening portions are fastened with the two second fastening portions respectively, while when the fastening element is at the releasing position, the two first fastening portions are detached from the two second fastening portions respectively.