The can opener with circular blade includes a pair of levers (2, 3) that are mutually pivoted in a scissor-like fashion toward one end and are provided, at the opposite end, with two handles (5, 6); a can drive assembly (7), which is mounted on one of the levers (2); a cutting assembly (8) with a circular blade (9), which is mounted on the other one of the levers (3); the drive assembly (7) is constituted exclusively by a pair of mutually connected parts including a knurled roller (10) and a knob (11). An assembly method is also provided, which can be performed on robotized production lines, for reducing production costs.