The invention discloses a project feasibility economic benefit evaluation method. The method comprises the steps that 1) the category of a project to be evaluated is acquired, and the correction rateof the cost control index of the category of project to be evaluated is acquired; 2) various influence factors influencing the settlement cost and feasibility cost of the project to be evaluated are determined; various influence factors are subdivided into a number of subdivided influence factors; the weight and fluctuation rate of each subdivided influence factor in each influence factor are determined; and 3) the feasibility economic benefit Ky of the project to be evaluated is calculated according to the correction rate of the cost control index of the category of project to be evaluated inthe step 1) and the weight and fluctuation rate of each subdivided influence factor in each influence factor in the step 2). The method can accurately and effectively evaluate the feasibility economic benefit of the project.