The present application relates to the technical field of adapter devices, and in particular to an adapter shell and an adapter. The adapter shell, used for providing a circuit board, comprises: a first shell, a second shell and a sliding plate. The first shell comprises a first bottom plate and a first annular lateral plate. The second shell comprises a second bottom plate and a second annular lateral plate. The sliding plate is movably connected to the second bottom plate, and the sliding plate and the second annular lateral plate are respectively positioned on two sides of the second bottom plate. The first annular lateral plate and the second annular lateral plate are detachably connected to each other in a sleeved manner to form a placing cavity for providing the circuit board.