The application provides a converter valve control system. The converter valve control system comprises a converter valve workstation with dual redundancy configuration, a converter valve top-layer control device, a merging unit, a time synchronization device, a fault recording device, N sets of converter valve middle control devices with dual redundancy configuration, a single set of converter valve bottom-layer control device, a first switch and a second switch. According to the converter valve control system, the converter valve top-layer control device processes an unblocking instruction and a modulating wave sent by a converter station protection system, a generated submodule input quantity instruction is sent to the plurality of converter valve middle control devices, the plurality of converter valve middle control devices send the unblocking instruction to the matched converter valve bottom-layer control device, and the converter valve bottom-layer control device is controlled to control the submodule in the converter valve to execute the unblocking instruction, so that the control quantity of the submodules in the converter valve can be reduced by the converter valve control device, and the purpose of rapidly controlling the converter valve can be achieved.