The invention discloses a primary-secondary cup food production method. A primary-secondary cup comprises a cup body and a cover film covering the cup body, and the cup body is provided with a first cavity and a second cavity. The primary-secondary cup food production method comprises the following steps of (1) extrusion molding, specifically, extruding a sheet to obtain the cup body connected with the sheet into a whole; (2) first filling, specifically, filling the first cavity with a first material; (3) film covering, specifically, covering the first cavity and the second cavity with cover films; (4) first sealing, specifically, sealing the first cavity; (5) punching, specifically, punching the sheet to enable the cup body to be separated from the sheet so as to form the independent cup body; (6) uncovering the film, specifically, uncovering the cover film covering the second cavity; (7) second filling, specifically, filling the second cavity with a second material; and (8) second sealing, specifically, after the cover film is reset, sealing the second cavity. In addition, the invention further discloses a production line for producing primary-secondary cup food by adopting the production method.