The present invention discloses a steam iron comprising a housing with a handle, a water container, a steam control device and a vapor chamber provided with an electric heating plate, wherein the steam control device comprising a pressure sensor mounted on the handle of said housing, a control board with a microprocessor and an execution unit for providing the water into said chamber or providing the vapor generated by a evaporator into said chamber for secondly heated; the execution unit is controlled by the control board by the pressure signal provided by said pressure sensor.