The utility model discloses a curtain for a partition in an automobile. The device comprises a cord fabric opening control part, a cord fabric winding and unwinding part, a cord fabric part, a cord fabric opening part and a device shell, the device shell is installed on an inner roof of an automobile. A cord fabric winding and unwinding part is arranged; the curtain cloth can be selectively put down or rolled up to control the put-down area of the curtain cloth, meanwhile, the curtain cloth opening control part is arranged to adjust the position of the curtain cloth and control the size of thepartitioned space, and the curtain cloth opening control part is simple in structure, flexible to use and capable of partitioning the limited space in the automobile and providing space for other people or some private spaces.