The invention provides a system for converting Excel into Word based on marking. The system includes a client, a design software server, a Word file server, a bookmark database server and a conversion server. According to the system and method for converting Excel into Word based on marking, in nuclear power engineering design software, design data in a Excel format can be quickly converted into a Word document, the format of the Word document is automatically adjusted, the workload for manual operation is reduced, a user can conveniently and rapidly complete compiling work of engineering design files, meanwhile data errors caused by manual entry are avoided, and the quality and efficiency of the file compiling work are improved.