A multifunctional paper bonding device, comprising a paper feeding mechanism, a paper bonding mechanism, an unwinding mechanism, and a control circuit. The paper feeding mechanism is provided with a chain rotation mechanism (1); the chain rotation mechanism (1) is configured to support a current working paper roll (2) and a new paper roll to be bonded (3), and is configured to convey the new paper roll to be bonded (3) to a preset position according to an instruction of the control circuit; the unwinding mechanism is provided with tightening belts (9); the tightening belts (9) are configured to be sleeved on the current working paper roll (2) and on the new paper roll to be bonded (3), and are configured to increase the friction of the paper roll to tension the paper.