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 . <EOS>