A lamp socket adapter includes a main body, a sleeve disposed outside of the main body, and a center electrode disposed at the rear end of the main body, in which a front end of the main body is provided with an insulating plug, the insulating plug has a through hole, the through hole is connected to a cavity of the main body, a first electrode sheet and a second electrode sheet each having a front end disposed in the through hole are arranged in the cavity, the rear end of the first electrode sheet is electrically connected to the center electrode, and the rear end of the second electrode sheet is electrically connected to the sleeve. Therefore, the lamp socket adapter of the present disclosure has the advantages of saving material costs, compact structure, and facilitating the fixing, mounting and replacement of a lamp bulb.