Disclosed is a downhole preheating starting method for a super heavy oil reservoir developed by means of dual-horizontal-well SAGD, the method comprising: loading concentric preheating tubular columns into well I and well P, injecting high-temperature fluid into inner tubes (4) of the concentric preheating tubular columns, performing circulation preheating, and performing extraction on outer tubes (3) of the concentric preheating tubular columns, or loading concentric tubes and resistance heating cables into the well I and the well P and performing continuous preheating; discharging a well shaft annulus fluid after the inter-well oil layer reaches the preheating ending condition, and soaking the wells; and entering an SAGD production stage.
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