The invention relates to the field of circuit board transport, in particular to a multifunctional conveying power device for circuit boards. The multifunctional conveying power device is characterized in that a first conveyor belt group comprises a first conveyor belt and a second conveyor belt which are parallelly arranged at an interval, a second conveyor belt group comprises a third conveyor belt and a fourth conveyor belt which are parallelly arranged at an interval, the belt face width and the belt face height of the second conveyor belt group are larger than those of the first conveyor belt group, the first conveyor belt group and/or the second conveyor belt group are/is arranged on a moving device to realize adjustable distance between the first conveyor belt and the second conveyor belt, as well as between the third conveyor belt and the fourth conveyor belt, the second conveyor belt group with wide belt faces is used for bearing the heavy circuit boards, and the first conveyor belt group with narrow belt faces is used for bearing the light circuit boards. The moving device is utilized to adjust the distance between the first conveyor belt and the second conveyor belt, as well as between the third conveyor belt and the fourth conveyor belt, so that the multifunctional conveying power device can adapt to the circuit boards of different sizes, and accordingly, the whole multifunctional conveying power device is wide in applicability.