The invention discloses a support frame erecting method, relates to the technical field of building construction, and mainly aims to solve the problem of unstable erection of support frames. The support frame erecting method comprises the following steps: S1, erecting a whole frame after a pier column is poured with concrete for the first time; S2, erecting a bracket; S3, setting out the bracket erecting range before erection; S4, arranging longitudinal and transverse bottom horizontal tubes at the bottom of the bracket; S5, arranging an adjustable screw rod at the top end of a vertical rod; S6, arranging a connecting tube; S7, arranging vertical diagonal bars on the periphery of and inside a template support frame in the longitudinal direction and the transverse direction; S8, arranging horizontal diagonal bars in the vertical direction on a frame body top layer horizontal rod setting layer of the template support frame; S9, taking a steel tube fastener diagonal bracing as a diagonalbar of the support frame; S10, covering the inner side of the outermost row of vertical frames of the support frame in a suspending manner with a dense screen. The support frame erecting method is easy to operate, the support frame is erected firmly, the construction progress is accelerated greatly, the security performance is high, and workers are protected from being injured in the constructionprocess.