The present invention provides a method for checking rolling angle stiffness of a cab stabilizer bar system, and belongs to the technical field of cab stabilizer bars. The method comprises the following steps: (1) calculating a deformation coefficient Gw of a cab stabilizer bar at a suspension position; (2) analyzing and calculating radial stiffness Kx of a rubber bush of the cab stabilizer bar; (3) calculating equivalent line stiffness Kws of a coaxial cab stabilizer bar system; (4) calculating rolling angle stiffness, as shown in the specification, of the coaxial cab stabilizer bar system; and (5) checking stiffness of the coaxial cab stabilizer bar system and performing ANSYS simulation verification. According to the method, the calculated value of the rolling angle stiffness of the coaxial stabilizer bar system can be obtained accurately and reliably, so that not only can the design level of the cab suspension and stabilizer bar system be improved, and smoothness and safety of vehicle driving can be increased; but also design and testing costs can be reduced, and reliable technical supports can be provided for development of CAD software of the cab stabilizer bar system.