A method of evaluating the risk grade of a new project crossing the existing road facility comprises the steps of firstly surveying a pipeline under the existing road facility, and obtaining a surveying result; 2, dividing the existing road facilities in the range of the influence area of the crossing project into three grades according to the importance of the existing road facilities; step 3, correcting the importance classification level of the existing road facility; 4, determining a construction method of a crossing project; 5, surveying the position relation between the crossing projectand the existing road facility and the distance between the crossing project and the existing road facility; 6, obtaining the approach relationship level of the crossing project and the existing roadfacility; 7, preliminarily evaluating the risk level of the crossing project; 8, correcting the risk level of the crossing project, and finally obtaining the risk level of the crossing project, so that the technical problems that a traditional risk grade division method is large in dependence on subjective judgment and inaccurate in division result are solved.