The invention belongs to the fields of tunnel construction safety monitoring and early warning, and discloses a subway safety far-end automatic monitoring and analyzing system and method. The system comprises a total station, a prism, a field server, an inclination sensor, an automatic acquisition box, a central database, a three-dimensional laser scanner, a processor and a tunnel structure extraction program module, wherein the total station is used for monitoring sedimentation data of a subway tunnel; the three-dimensional laser scanner is used for scanning and acquiring three-dimensional point cloud data of the subway tunnel and a track; and the tunnel structure extraction program module is used for obtaining a fracture surface deformation situation, a convergence deformation condition,a condition of duct piece faulting of slab ends and a rail distance deformation condition of the subway tunnel structure from the three-dimensional point cloud data based on a least squares-based section fitting method when the tunnel structure extraction program module is called by the processor. According to the method, the defect that the three-dimensional overall deformation information of the tunnel cannot be acquired by the total station and the inclination sensor is overcome; and the three-dimensional laser scanning analysis technology is applied to subway operation monitoring, so thatcomprehensive and automatic monitoring is realized.