The invention discloses a power reversal control method and a power reversal control device for a hybrid direct-current power transmission system. The hybrid direct-current power transmission system at least comprises double poles, wherein one pole is a conventional direct-current power transmission system (LCC-HVDC) based on a thyristor technology, the other pole is a flexible direct-current power transmission system (Flexible-HVDC) based on a full-control type power electronic device, and each pole is an independent direct-current power transmission sub system. In a power reversal process, active power conveyed by the hybrid direct-current power transmission system is continuously changed to be negative from positive, and net reactive power of a convertor system at each end of the hybrid direct-current power transmission system is kept constant in the power reversal process. The automatic power reversal method can effectively reduce interferences to an interconnected alternating-current network and realizes stable direct-current power reversal.