The invention provides a positioning method and device for a loose component of a nuclear power station, computer equipment and a storage medium. The positioning method for the loose component of thenuclear power station comprises the following steps: calculating the distance difference between each grid node and any two sensors in a sensor set in a preset monitoring area; analyzing the time difference when any two sensors in the sensor set receive an impact signal respectively if the impact signal of the loosening component is detected; calculating the wave velocity variance corresponding toeach grid node according to the distance difference and the time difference; acquiring the intersection position of the grid node corresponding to the minimum value in the wave velocity variance in the monitoring area; determining the falling point position of the loosing component according to the intersection position; outputting a positioning result of the loose component according to the falling point position. Calculation accuracy of the falling point position of the loose component can be effectively improved with the technical scheme, and positioning accuracy of the loose component canbe improved.