The utility model provides a converter valve cooling system and a converter valve of a converter station, and relates to the technical field of equipment cooling, the converter valve cooling system comprises an outer air cooling subsystem and an inner water cooling subsystem; wherein the external air cooling subsystem comprises a frequency conversion cabinet, a control cabinet and a fan; the fan is respectively connected with the frequency conversion cabinet and the control cabinet; the fan is also connected with the external air cooling subsystem; wherein the frequency conversion cabinet comprises a frequency converter, a contactor and a circuit breaker which are connected in sequence; the frequency converter is used for supplying variable-frequency power to the fan; the contactor is usedfor controlling on-off of a line where the frequency converter and the fan are located. The circuit breaker is used for cutting off a circuit between the frequency conversion cabinet and the fan whenthe cooling system breaks down; the control cabinet is used for controlling the fan to operate according to a preset mode; the draught fan is connected with the inner water cooling subsystem and usedfor providing air volume for cooling water in the inner water cooling subsystem so as to reduce the temperature of the cooling water. According to the utility model, the operation stability of the converter valve cooling system can be effectively improved.