The invention discloses an adjustable intramedullary nail aiming device with a locking function for the tibia. The adjustable intramedullary nail aiming device further comprises a second ejector rod,wherein the second ejector rod penetrates through a second round rod along the axis line of the near end of the intramedullary nail and is detachably fixed to the second round rod, at least one firstscrew hole convexly extends along the axial direction of the intramedullary nail, and the second ejector rod extends to the first screw hole. The adjustable intramedullary nail aiming device has the advantages that through a first round rod and the second round rod of a rotation shaft, the intramedullary nail is accurately fixed, when a first nail needs to be pegged in, the first screw hole convexly extending along the axial direction is selected, after the nail is pegged in, the nail is pushed towards the far end of the intramedullary nail through the second ejector rod, the second ejector rod is detachably connected with the second round rod through threads, jacking can be realized conveniently, and then the broken bones are in good lamination.