The invention discloses a method for measuring the flame propagation velocity of a Bunsen burner during the combustion process of gaseous fuel based on a surface integral image processing technology, relating to a method for measuring the flame propagation velocity. The invention overcomes the problem that the gas fuel has low accurate measurement result when the flame propagation velocity is measured during the Bunsen flame process by the prior binary image processing technology. The method for measuring the flame propagation velocity of a Bunsen burner during the combustion process of gaseous fuel is realized by the following steps of: igniting gaseous fuel in the Bunsen burner to generate flame of the Bunsen burner; performing N times of imaging on the flame of the Bunsen burner by a CCD imaging device; performing brightness analysis and edge extraction on each image and then performing curve fitting; performing curve integration on the area surrounded by the fit curve to obtain the superficial areas of the inner flame frontal surfaces in the flame of the Bunsen burner in each image, averaging the superficial areas to obtain the current superficial area value of the inner flame frontal surface in the flame of the Bunsen burner; and calculating the flame propagation velocity of the Bunsen burner according to the superficial area value of the inner flame frontal surface in the flame and the gas flow rate. The method for measuring flame propagation velocity of Bunsen burner during combustion process of gaseous fuel is suitably used for measuring the flame propagation velocity of the Bunsen burner during the combustion process of gaseous fuel.