Line project cost risk assessment method

The invention relates to a line project cost risk assessment method, which comprises the steps of S1, making an original database of which project settlement approval is completed based on Excel, and obtaining a historical project database; s2, decomposing the project into a foundation project, a tower project, a grounding project, a wiring project and an accessory project according to contents included in the line project, and performing data screening and arrangement on the historical project database obtained in the step S1 through Excel to obtain cost original data of five unit projects in the completed project; s3, making a line project cost data calculation table; and S4, making a line project cost risk early warning index data table based on Excel, extracting original data in a historical project database, and obtaining cost data of five unit projects of each iron tower foundation project, tower project, grounding project, stringing project and accessory project under corresponding screening conditions