The invention discloses a climbable height-limiting portal frame. The climbable height-limiting portal frame comprises stand columns arranged on the two sides in the transverse direction respectively and a transverse rod arranged between the stand columns arranged on the two sides in the transverse direction, the stand columns are arranged on a guide rail used for supporting the end of the transverse rod and guiding motion, the guide rail is used for guiding the transverse rod upwards when the transverse rod moves backwards in the longitudinal direction, and a blocking part playing a blocking role on the transverse rod is arranged on the guide rail. The height-limiting portal frame can effectively avoid the phenomenon that damage of the height-limiting portal frame is caused after an over-high truck conducts rigid collision on the height-limiting portal frame, and the maintenance workload is reduced; the phenomenon that due to the fact that the over-high truck is too high in speed, the collision energy is large, and then the over-high truck is seriously damaged and a driver is hurt can be effectively avoided; the phenomenon that due to the fact that the over-high truck collides with the portal frame on the condition that the over-high truck is too high in speed and too large in load, the portal frame topples is effectively avoided, and then the accidents are avoided.