Production equipment of back film of solar battery pack

The utility model relates to production equipment of a back film of a solar battery pack. The production equipment comprises an unreeling device, coating devices, a drying tunnel area, a reeling device, an intermediate traction mechanism and a detection platform, wherein two ends of the drying tunnel area are transition areas; the coating devices are a front-surface coating device and a back-surface coating device which are respectively arranged at the outer sides of the end parts of the two transition areas; the drying tunnel area and the transition areas are of an up-down bilayer structure and shaped as a rectangular box body; the unreeling device and the reeling device are respectively arranged on one end where the front-surface coating device is arranged; the lower drying tunnel and the upper drying tunnel are respectively comprise an infrared heating section and an oil heating section; the transition areas comprise a first transition area and a second transition area which respectively comprise a levelin