The invention discloses a production method for high-purity n-heptane. According to the method, a raw material (5) is rectified and separated in an isoheptane removal tower (1); light component-removed crude n-heptane at the bottom of the isoheptane removal tower (1) enters an extracting and rectifying tower (2) and has countercurrent contact with a compound circulation solvent (10) so as to realize extraction and rectification; a top material flow of the extracting and rectifying tower (2) enters an n-heptane re-evaporation tower (4) for rectification; a tower top material flow of the n-heptane re-evaporation tower (4) flows into a return tank (15), a part of the tower top material flow returns to the n-heptane re-evaporation tower (4), and the other part of the tower top material flow is discharged as a product (16); a bottom material flow of the n-heptane re-evaporation tower (4) flows into the extracting and rectifying tower (2); a bottom material flow of the extracting and rectifying tower (2) enters a solvent recovery tower (3) for recovery; after recovery, a bottom material flow of the solvent recovery tower (3) returns to the extracting and rectifying tower (2); and a top material flow of the solvent recovery tower (3) flows back to a tank zone as a heavy component. The production method has the advantages of high product purity and low energy consumption of facilities.