Method for grinding turnout switch rail through intelligent steel rail grinding trolley

The invention discloses a point rail grinding method of an intelligent steel rail grinding trolley. The line types, reference profiles and actually-measured key section profiles of various turnout switches are pre-stored in a control system of the intelligent steel rail grinding trolley; meanwhile, longitudinal positioning systems consisting of rotary encoders and specular reflection photoelectric switches are respectively arranged at the positions, needing to be positioned, of the trolley and the steel rails; during grinding, the position information of the grinding trolley at the point of the switch rail is determined firstly, then the position information of the grinding trolley in the rail length direction can be obtained in real time according to measurement of an encoder, so that the target profile and actually measured profile section information of the current position of the trolley can be determined in combination with preset information, and profile deviation values of different sections are calcul