The invention relates to a vehicle roof power supply interface device and belongs to the technical field of vehicle-mounted devices. The technical problem is mainly solved that a vehicle-mounted device is inconvenient tin power supply connection. The mainly adopted technical scheme is that the vehicle roof power supply interface device comprises a housing, a circuit board, a wire and a power supply socket. The housing is arranged at the indoor top of an automobile. The circuit board is arranged in the housing. The wire is used for connecting the circuit board and a circuit system of the automobile. The power supply socket is formed in the housing and is connected with the circuit board. The housing of the vehicle roof power supply interface device can be arranged at the indoor top of the automobile, the power supply socket for supplying power for the vehicle-mounted electronic device is located in the housing, and the circuit board obtains electricity from the circuit system of the automobile through the wire and transmits the obtained electric energy to the vehicle-mounted electronic device through the power supply socket. The wire can be hidden and arranged in automobile circuits. Compared with the prior art, power supply of the vehicle-mounted electronic device can be facilitated.