Abstract: The present disclosure discloses a method for measuring an antenna downtilt based on linear regression fitting, including: performing image instance segmentation on an inputted original antenna image using a deep learning method to obtain a segmented image; performing mask processing on the segmented image; performing mathematically linear modeling and fitting on the segmented image subjected to mask processing; and the performing mathematically linear modeling and fitting on the segmented image subjected to mask processing including: extracting pixel value coordinates of an antenna edge contour from the segmented image subjected to mask processing, and capturing a pixel value of a right-end edge of the antenna; and fitting the pixel value coordinates into a straight line by using a mathematically linear modeling and fitting method to obtain an angle of the antenna downtilt.