Compound machine with back coating function

The utility model relates to a compound machine, in particular to a compound machine with a back coating function, which is applicable to compounding base paper (such as transfer card paper and copper paperboards) and base films (such as plastics) to form composite paper. The compound machine with the back coating function comprises a framework, a base film unwinding roll, a first guiding roll, a second guiding roll, a complex adhesive groove, an adhesive coating roll, a first press roll, a third guiding roll, a compound supporting roll, a second press roll, a main baking oven, a take-up roll, a base paper unwinding roll, a fourth guiding roll, a fifth guiding roll and a sixth guiding roll, wherein the main baking oven is positioned between the compound supporting roll and the take-up roll, and after being compounded by the compound supporting roll and the second press roll, a composite film penetrates through the main baking oven prior to being taken up on the take-up roll. The compound machine is characterized in that a back coating device is arranged in a base paper movement direction between the sixth guiding roll and the compound supporting roll. The compound machine has the back coating function.