Rail geometrical state measuring apparatus

The utility model discloses a rail geometrical state measuring apparatus, which not only can measure a relative space position between two steel rails, but also can be combined with a total station to directly measure actual tridimensional space positions of rail panels or steel rails. The rail geometrical state measuring apparatus comprises a traveling mechanism consisting of transverse beams and the like and measuring mechanisms such as a measuring wheel, an inclination sensor, a rail gauge sensor and the like, the transverse beams are provided with an electrical appliance control unit with a single board computer, a rail center line prism table, and a calibration correction prism table, a distance between the rail center line prism table and the outer edge of the fixed measuring wheel is 1/2 of a standard rail gauge, the calibration correction prism table is located above the fixed measuring wheel and coaxial with the same, a travelling wheel is provided with a rotary encoder, a displacement sensor, the inclination sensor and a wireless transmission module are connected with the single board computer and combined with the total station to measure coordinates of a rail center line prism. The rail geometrical state measuring apparatus can realize measurement of geodetic coordinates and relative position relationships, can not only perform relative measurement but also perform absolution measurement, and is adaptable to maintaining and measuring the existing railways and directly lofting when building new railways.