Spatial filtering method (SFM) based on linear CCD cannot directly measure the velocity distribution of granular flow in a rotating drum, meanwhile, it is difficult to measure accurately the velocity at the single-point region with complex velocity in the granular flow. In view of that, a new granular flow measurement method based on array CCD spatial filtering was proposed. Captured images were divided so as to form simulated sub-filters, SFM was performed separately at each sub-filter region, and then, the velocity distribution of granular flow in the rotating drum could be measured. For the end wall region with complex velocity variation in the rotating drum, an orthogonal vector algorithm was used for the velocity vector sum operation, which could avoid errors caused by the angle measurement, thereby improve the accuracy of single-point region velocity measurement. Finally，an experimental rig was set up to verify the method.Resolution and accuracy were analyzed, as well. The results show that array CCD-based SFM can measure the velocity distribution of granular flow in the rotating drum, and the measurement error is lower than 2%.