The invention relates to a dismounting and mounting structural lamp chassis. The dismounting and mounting structural lamp chassis comprises four arc-shaped bottom plates which are structured the same,wherein the cross sections of the arc-shaped bottom plates are U-shaped, and two ends of the arc-shaped bottom plates communicate with the inner parts of the arc-shaped bottom plates; the four arc-shaped bottom plates are connected in an end-to-end manner to form a complete circular ring; heat dissipating structures are formed at the bottom parts of the four arc-shaped bottom plates; and storingstructures and clamping port structures are arranged at two inner ends of each arc-shaped bottom plate. The dismounting and mounting structural lamp chassis has the advantages that the mounting is convenient; the die opening cost is low; the connection strength of every two arc-shaped bottom plates is high; the service life of the lamp chassis is long; the conveying is convenient; the mounting cost is decreased; and the use cost of customers is decreased.