UV photocuring device for printing roller proofing

The UV light curing device comprises a UV light source mechanism, a rotating mechanism and a controller, the UV light source mechanism comprises a shell, an LED lamp panel and a handle, the LED lamp panel is arranged on one side of the shell, and the handle is arranged on the other side of the shell; the rotating mechanism comprises a machine base, a first bearing seat, a second bearing seat, a rotating shaft, a driving part, a connecting shaft and an ejector head, the first bearing seat and the second bearing seat are slidably arranged on the machine base and can be relatively close to or away from each other, and the rotating shaft is rotationally connected to the first bearing seat and can be clamped to one end of the printing roller; the driving part is arranged on the first bearing seat and used for driving the rotating shaft to rotate, the connecting shaft is rotationally connected to the second bearing seat, and the end, away from the second bearing seat, of the connecting shaft is connected with an ej