The application relates to a cabinet lamp and a lamp cabinet. The cabinet lamp includes a lamp housing, an elastic member and a light-emitting assembly. The lamp housing includes a first shell plate and a second shell plate. The first shell plate and the second shell plate enclose a first space. A surface of the first shell plate surrounding the first space or a surface of the second shell plate surrounding the first space is provided with a first connection part. The elastic member includes a second connection part, the elastic member fits with the first space in a plugging-in manner, and the second connection part is in snap fit with the first connection part. The elastic member is configured to be installed on an inner top wall of the lamp cabinet. The light-emitting assembly is installed on the lamp housing.