The invention discloses a method for analyzing tunnel segmental lining internal force. The method comprises the steps that (1) a beam-spring-contact model of segmental lining is established; (2) according to engineering materials, annular rigidity of a first spring unit at each joint, rotation rigidity of rotation around the Z axis as well as elastic rigidity of a second spring unit are computed; (3) rigidity of a point-point contact unit is computed according to the engineering materials; and (4) internal force of segmental lining is computed according to the rigidities obtained computed at the steps (2) and (3). According to the invention, interaction effects between duct piece sections and duct pieces as well as combined bearing characteristics of segmental lining and surrounding rocks are considered, so that force bearing characteristic of segmental lining could be analyzed more effectively.