The invention discloses a light adjusting mechanism of a vehicle lamp. The light adjusting mechanism of the vehicle lamp comprises a stepped first support and a plurality of lens assemblies arranged on the first support, wherein the lens assemblies comprise at most one first lens assembly and at least one second lens assembly, the first lens assembly is fixedly connected with the first support, and the second lens assemblies are arranged on the first support in a swinging manner through an adjusting assembly; when a plurality of lens assemblies exist, the first lens assembly is directly mounted on the first support, the remaining second lens assemblies are fixed on the first support through two first screws and one first adjusting screw, and the first lens assembly serves as a reference for secondary adjustment; and when light type layering occurs, effects of consistent light types and attractive appearance can be achieved by adjusting the corresponding first adjusting screws, and theprocess is convenient and high in efficiency.