The present invention relates to a breeding pond. The invention provides a breeding pond with a water level control mechanism. The breeding pond with the water level control mechanism comprises a breeding pond and a river. An isolation embankment is arranged between the breeding pond and the river and is internally provided with a liquid storage cavity and a first channel. The top wall of the liquid storage cavity is provided with a first water hole which communicates with the river. The liquid storage cavity is also provided with a floating ball and a second water hole which communicates withthe breeding pond. The floating ball is used for being floated by water in the liquid storage cavity to block the first water hole. The second water hole is internally provided with a second water hole part plug and a plug driving spring which drives the second water hole part plug to move toward the breeding pond to be opened. One end of the first channel communicates with the first water hole,and the other end is provided with a water pipe. An end face of one end of the second water hole part plug far from the liquid storage cavity is provided with a concave hole, and a water pipe can passthrough the concave hole in sliding and sealing ways. The invention provides the breeding pond with the water level control mechanism, water can be automatically supplemented to a set water level, and a problem that the water supplementation of an existing breeding pond needs artificial care is solved.