The invention discloses a blade root guide circle molding structure of an axial flow fan rotor blade. The blade root guide circle molding structure of the axial flow fan rotor blade comprises a bladebody (1), a blade disc (2), a blade root guide circle (3) arranged between the blade body (1) and the blade disc (2) and blade root grooves (4) formed in two sides of the blade root guide circle (3).According to the blade root guide circle molding structure of the axial flow fan rotor blade, the blade root guide circle and a blade root groove structure can be reasonably arranged between the rotorblade of the axial flow fan and the blade disc on the premise that the aerodynamic performance of the axial flow fan is not affected or affected to a lesser extent, so that the strength at the bladeroot of the axial flow fan rotor blade is increased, and therefore the safety problem of the rotor blade in the use process is solved.