The invention relates to the technical field of steel structure 
punching, and discloses a steel structure 
punching auxiliary device capable of adjusting the 
punching depth. The steel structure punching auxiliary device capable of adjusting the punching depth comprises a device main 
body frame and an operation table, wherein a drilling 
machine is arranged above the operation table, a driving device is arranged on the drilling 
machine, and a 
threaded rod is arranged at the upper part of the device main 
body frame; a gear is arranged below the 
threaded rod, a toothed rod is arranged on the left side of the gear, a sleeve is fixedly connected to the left side of the toothed rod, and a connecting piece is arranged between the sleeve and the driving device. According to the steel structure punching auxiliary device capable of adjusting the punching depth, the longest distance that the driving device drives the drilling 
machine to move downwards is not changed, the 
threaded rod drives the gear to rotate 
clockwise when the drilling depth needs to be reduced, the tooth rod on the left side of the gear moves upwards along with the gear, the tooth rod moves upwards to drive the sleeve to move upwards, and the sleeve moves upwards to drive the connecting piece and the driving device to move upwards, so that the drilling depth is reduced when the drilling machine moves downwards, and the effect of adjusting the drilling depth is achieved through the structure.