A lamp trim, comprising: a trim body, configured to be sleeved on a lamp body outer wall of a lamp body; an elastic engaging part, provided on an inner wall of the trim body, wherein the elastic engaging part is elastically deformable perpendicularly to an axis of the trim body, from a center of the trim body towards a peripheral direction of the trim body, and is also elastically deformable in an axis direction of the trim body; a first side surface of the elastic engaging part facing the center of the trim body is configured to abut against the lamp body outer wall, and a second side surface of the elastic engaging part facing an opening portion of the trim body is configured to abut against an installation convex edge of the lamp body; the inner wall of the trim body is further provided with an engagement groove which is located between the elastic engaging part and the opening portion of the trim body; and an engagement ring, snapped into the engagement groove, wherein the engagement ring is configured to abut against the installation convex edge, and the installation convex edge is located between the elastic engaging part and the engagement ring, characterized in that the elastic engaging part comprises a plurality of elastic engaging arms circumferentially arranged at intervals along the inner wall of the trim body, each of the elastic engaging arms comprises a first end and a second end opposite to each other, the first end is fixedly connected with the inner wall of the trim body, the second end suspends and extends towards the center of the trim body, and the second end is bent towards the opening portion of the trim body. a trim body, configured to be sleeved on a lamp body outer wall of a lamp body; an elastic engaging part, provided on an inner wall of the trim body, wherein the elastic engaging part is elastically deformable perpendicularly to an axis of the trim body, from a center of the trim body towards a peripheral direction of the trim body, and is also elastically deformable in an axis direction of the trim body; a first side surface of the elastic engaging part facing the center of the trim body is configured to abut against the lamp body outer wall, and a second side surface of the elastic engaging part facing an opening portion of the trim body is configured to abut against an installation convex edge of the lamp body; the inner wall of the trim body is further provided with an engagement groove which is located between the elastic engaging part and the opening portion of the trim body; and an engagement ring, snapped into the engagement groove, wherein the engagement ring is configured to abut against the installation convex edge, and the installation convex edge is located between the elastic engaging part and the engagement ring, characterized in that the elastic engaging part comprises a plurality of elastic engaging arms circumferentially arranged at intervals along the inner wall of the trim body, each of the elastic engaging arms comprises a first end and a second end opposite to each other, the first end is fixedly connected with the inner wall of the trim body, the second end suspends and extends towards the center of the trim body, and the second end is bent towards the opening portion of the trim body.