Aiming at the problems of high risk and poor accuracy in common blowout fluid velocity measurement methods, in order to measure the blowout fluid flow velocity safely and accurately, a calculation method of blowout fluid velocity based on sequence images and pinhole imaging was proposed and carried out corresponding experiments. The method uses a camera and a self-developed blowout simulation device to obtain a large number of sequence images of simulated blowouts, selects two frames of images before and after, and uses the SIFT algorithm to extract the feature points of the two images respectively, and then uses the FLANN algorithm to extract the feature points for feature matching, and finally the RANSAC algorithm is used to eliminate the mismatched feature points. After obtaining the accurate matching feature points between the two images, the coordinate positions of these pixel points are extracted and the displacement distance between the matching feature points is calculated. Finally, the flow rate of blowout fluid is calculated by the method based on pinhole imaging. The experimental results show that a more accurate flow rate of blowout fluid can be obtained, so as to more accurately estimate the harm of blowout and ensure the personal safety of field operators.