The invention discloses a method for monitoring intra-furnace dynamic wall temperature in a high-temperature tube system of a power station boiler in the technical field of the power station boilers. The method disclosed by the invention comprises the steps of: precomputing to obtain a representative tube with the minimal allowance of intra-furnace inner wall temperature in a tube group for installation of a furnace outer wall temperature measurement and collection point; reading data required for calculation of real-time operation of the boiler, the extra-furnace wall temperature and the like from a real-time database of a power plant, and storing the data in a relational database of a local server; generating real-time dynamic calculation of intra-furnace working medium temperature and intra-furnace metal wall temperature of a superheater and reheater tube system of the power station boiler according to real-time data of the real-time operation and the extra-furnace metal wall temperature; and separating the data of a metal tube section exceeding a tube wall metal stress intensity over-temperature value part and storing the data in an over-temperature summary database. The method disclosed by the invention effectively combines dynamic online calculation with dynamic online monitoring of practical working conditions so that the technical effect of prolonging the service life of the tube system is achieved and the technical problem on preventing over-temperature tube explosion of the tube system of the power station boiler is solved.