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The application relates to the technical field of lighting appliances, in particular to a lamp mounting shell module and a lamp. The lamp mounting shell module comprises a mounting support, a mounting shell and a fastener. The mounting support comprises a support body and a positioning piece. The positioning piece is fixedly arranged on the support body. The support body is arranged on a mounting site of the lamp. The support body is provided with a connecting hole. The mounting shell comprises a side wall. The side wall is arranged in a surrounding mode to form a containing space. The side wall is provided with a locking groove group. The locking groove group comprises a first positioning groove and a second positioning groove. The first positioning groove and the second positioning groove respectively extend along the circumference of the side wall. The mounting support is arranged in the containing space to make the connecting hole and the second positioning groove communicate. The positioning piece is movably embedded in the first positioning groove. The fastener is arranged in the second positioning groove and the connecting hole and is used for connecting the side wall and the support body. The lamp comprises a light-emitting assembly and the lamp mounting shell module. The connection reliability between the mounting shell and the mounting support of the lamp mounting shell module is high.