The invention discloses a method of evaluating a shale gas reservoir by using a pressurization index and relates to the technical field of exploration and development of oil and gas. The method comprises the steps of a, collecting parameters of fracturing construction; b, selecting the preferred fracturing parameters according to the construction situation; c, establishing correlation for the selected fracturing parameters and performing processing; d, calculating by using the processed parameters to obtain the pressurization index F; and e, performing comparison and evaluation on the shale gas reservoir according to the obtained F (the pressurization index). According to the invention, the shale gas reservoir is evaluated by using the pressurization index, the reservoir is evaluated according to the comparison and selection of the pressurization index in an environment of developing of shale gas in large scales currently, and the method, as a single means for evaluating the reservoir, has extremely good operability and on-site practical applicability.