The invention discloses a power dynamic balance redundancy control device of a drive scraper of frequency conversion all-in-one machine. A control way of the power dynamic balance redundancy control device is a redundancy control way; the control device is composed of a primary control module and an auxiliary control module, wherein the primary control module is in communication control by a CAN bus, is excellent in performance, is high in rate, is long in communication distance, and is strong in capacity of resisting disturbance, can quickly and effectively acquire and compare a torque signalof a front-tail frequency conversion all-in-one machine of a scraper conveyor to regulate rotation speed of a tail all-in-one machine, so that power dynamic balance is realized; the auxiliary controlmodule is started when the primary control module is disabled as a result of faults, and rotation speed of the tail all-in-one machine is regulated by acquiring and comparing the torque signal of thefront-tail all-in-one machine, so that power dynamic balance still can be realized. The device is of great significance in improving safety and reliability of the power balance control system of thescraper conveyor.