The utility model belongs to the field of navigation marks and other devices in the Yangtze river basin, and relates to an auto-control type water compensation system which comprises a box, a vent pipe, a water level gauge, a water drainage branch pipe, a machine connecting pipe and a water drainage and blow-off pipe. The vent pipe, the water level gauge, the water drainage branch pipe, the machine connecting pipe and the water drainage and blow-off pipe are communicated with the box through pipelines. The auto-control type water compensation system further comprises an automatic water adding device and a water adding record control box.