To provide a manufacturing method and manufacturing equipment of a steel sheet for obtaining good material stability and flatness.

In the manufacturing equipment of the steel sheet in which a finishing mill 1, a first shape straightening device 2, a first cooling unit 3, a second cooling unit 4 and a second shape straightening device 5 are arranged in this order from the upstream side in the conveying direction and the steel sheet is on-line cooled and straightened, the manufacturing method is constituted so that the feed flow rate of water per unit area is set to ≥1,500 L/min×m2 in the first cooling unit 3, the feed flow rate of water per unit area is set to 200 to 700 L/min×m2 in the second cooling unit 4, also the cooling with the first cooling unit 3 is completed by transition boiling and the cooling with the second cooling unit 4 is started by transition boiling.