The invention provides a lens assembly and a mobile terminal, the lens assembly is applied to the mobile terminal, the mobile terminal is provided with a shell, the shell comprises an inner surface and an outer surface which are oppositely arranged, a through hole is formed in the shell, and the lens assembly comprises a supporting plate, a first sleeve and a second sleeve; the supporting plate ishermetically connected with the inner surface through adhesive glue; the first sleeve is inserted into the through hole and connected with the supporting plate in a sealed mode through adhesive glue;and the second sleeve is nested outside the first sleeve and is hermetically connected with the outer surface. According to the technical scheme, the support plate is hermetically connected with theshell; the first sleeve is hermetically connected with the supporting plate after being inserted into the through hole; therefore, the lens assembly can be assembled from two directions. The installation of the lens assembly is facilitated, the assembly precision requirement of the lens assembly during installation is reduced, the product qualification rate is improved, in addition, when the lensassembly is subjected to external force collision, force is transmitted from the first sleeve to the second sleeve and then transmitted to the shell, and therefore the impact force borne by the shellcan be relieved.