The invention discloses a method for improving recovery efficiency for deep common thickened oil water drive-converting into-steam flooding. The method comprises stopping injecting water into a water injection well after water drive for a thickened oil reservoir inner well and common thickened oil water-containing reaching 90%, then transferring into producing well regular production, encrypting a new thermal production well on a water drive bypass line for steam huff and puff exploitation, and continuously injecting steam into an oil layer by a steam injection well after oil layer pressure decreased under 9 MPa. The steam injected by the steam injection well is high dry steam with outlet dry degree more than 95% and produced by a high dry boiler; the steam injection well employs a high efficient heat-insulating pipe column with thermal loss per kilometer of 5%; and shaft bottom dry degree is no less than 60%. Unfavorable effects on steam drive by high water-containing rate and high pressure of the stratum after water drive are overcome via flow line conversion and high dry degree steam, so effective steam drive of common thickened oil reservoir after water drive can be achieved even with high water-containing rate (no less than 90%) and high pressure (7 to 9MPa); limitations to steam drive due to high pressure and high water-containing rate of deep water drive thickened oil stratum can be eliminated; and common thickened oil reservoir crude oil recovery efficiency after water drive can be greatly improved.