The invention discloses a roof structure of a compartment. The roof structure of the compartment comprises a middle roof plate, a side roof plate, a luggage rack and an installation beam, wherein the installation beam is fixedly connected with the middle roof plate, the installation beam is provided with a positioning groove, the second end of the side roof plate is fixedly connected with the luggage rack, an installation hole corresponding to the positioning groove is formed in the first end of the side roof plate, and the installation hole and the positioning groove are fixedly connected through the second end of the side roof plate and the installation beam by means of a fastener. The invention further discloses the compartment which comprises the roof structure. According to the roof structure of the compartment and the compartment, when the side roof plate and the installation beam are manufactured, the installation hole and the positioning groove are formed, as a result, installation can be achieved by directly conducting connection by means of the fastener during installation, the installation efficiency can be improved, and labor intensity of workers can be relieved.