The utility model provides a slot type profit heat transfer island steam temperature control device with one, secondary steam system. The present internal slot type solar photothermal power power station that does not have the large scale business ization operation, lack to have one, the design experience of the slot type solar -thermal power generation profit heat transfer island steam temperature control mode of secondary steam system. The utility model discloses the constitution includes: a set of over heater (1), a set of evaporimeter (2), a set of pre -heater (3), a set of re -heater (4), over heater and conduction oil entry (6) be connected, pre -heater and conduction oil export (7) be connected, the over heater be provided with and transfer oily bypass (8), the over heater the left end position with the right -hand member position of pre -heater connect through overhauing bypass (9). The re -heater be provided with and transfer oil to overhaul bypass (10). The utility model discloses be applied to slot type profit heat transfer island steam temperature control device with one, secondary steam system.