The utility model relates to a power station water discharge control system, which comprises a plurality of water pumps for discharging out water from a power station water pool, wherein a water level sensor is arranged in the water pool, the water level sensor transmits sensing signals to a PLC (programmable logic controller), each water pump is connected with the PLC through a soft starter, and the PLC starts the corresponding soft starter according to the sensing signals. The power station water discharge control system adopts the PLC, the water pump is started in real time according to the water level of the water pool and the state of a liquid level switch, the water leakage of the power station is handled in real time, or the accumulated water during the overhaul is discharged in real time, the water accumulation and the dampness inside a plant building are avoided, the normal operation and overhaul of equipment in a hydropower station is ensured, the unattended operation and the automatic control function are realized, and the work load of personnel is reduced.