An indicator lamp assembly includes a housing, a lamp source assembly, a convex lens, and a light guide pillar. The housing has a light guide cavity including a light inlet and a light outlet. An inner diameter of the light guide cavity gradually increases in a direction from the light inlet to the light outlet. The lamp source assembly includes a circuit board fixed to the housing and a lamp source mounted at the circuit board. The convex lens is fixed to the housing and disposed at the light outlet. The light guide pillar is fixed to the housing and located between the lamp source and the convex lens. The light guide pillar is configured to guide light emitted by the lamp source to the light inlet. A portion of the light is reflected by a cavity wall of the light guide cavity and further emitted to the convex lens.