In order to solve the problems of low efficiency and high cost in weighing coal gangue loading, a non-contact coal gangue loading volume measurement method based on laser triangulation was proposed. First, the laser stripe information projected by the laser on the surface of the moving carriage full of coal gangue was continuously collected using the CCD camera. The target area of the image was extracted through median filtering method and threshold segmentation method based on Otsu algorithm during the image pre-process at the same time. Then the center line of the laser stripes were extracted using skeleton-based gray barycentric method. Finally, the Riemann integral method is used to calculate the coal gangue loading of the vehicle. The results show that the error of the system results is controlled within 4%, which meets the requirements of system operation, confirming the feasibility and practicability of the measurement method. This research provides a reference for the load measurement of highway transportation management in complex environments.