The invention discloses a method for acquiring an insertion depth of a propping agent. The method sequentially comprises the following steps: (A) calculating a transient insertion depth H1 of the propping agent; (B) calculating a creep insertion depth H2 of the propping agent; (C) calculating a correction factor b of the transient insertion depth of the propping agent; (D) calculating a total insertion depth H: H=b*H1+H2 of the propping agent according to the following formula. According to the method disclosed by the invention, the insertion depth of the propping agent in rock can be accurately predicted according to construction parameters and stratum parameters, so that not only is the uncertainty generated by artificial prediction by experiences avoided, but also the defect that the insertion depth of the propping agent cannot be obtained because a core size is in inconformity to demands or core data are absent is overcome. The method disclosed by the invention is reliable in principle and high in calculation precision, and is capable of providing an accurate insertion depth prediction value of the propping agent for fracture design, thereby providing more effective guidance for the fracture construction design.