The invention discloses a thematic charting system based on a web technology. The thematic charting system comprises a data collection and acquisition system, a data repetition removal system, a graph splitting module system, a splitting module redefinition system, an information demand editing input device, a graph modularization recombination system, a charting system, an industry regulation and graph output specification, an image sharpening renderer and a formed graph output end. The invention belongs to the technical field of network charting, particularly relates to a web technology-based thematic charting system, effectively solves the problems of high charting requirements and low charting efficiency in the existing market, and provides a method for making a reasonable thematic map by a person without or with little charting knowledge, solving key technologies and problems and improving the charting efficiency. Therefore, the professional threshold of thematic map making is lowered, the thematic map making efficiency is improved, the application range of thematic map making is widened, and the thematic map making system based on the web technology is automatic, intelligent and rapid in thematic map design and making.