Pile hammer with telescopic vertical columns

The invention discloses a pile hammer with telescopic vertical columns, which is simple in structure, convenient in operation and safe in use and comprises a bottom plate. A pile driving frame is hinged with the front end of the bottom plate and comprises outer vertical columns, inner vertical columns are telescopically connected in the outer vertical columns, the outer vertical columns are slidably connected with lower guiding devices, upper guiding devices are slidably connected outside the inner vertical columns, and the upper guiding devices correspond to the lower guiding devices. The lower guiding devices are fixedly connected with lower butting tongues, the upper guiding devices are fixedly connected with upper butting sleeves, and the upper butting sleeves correspond to the lower butting tongues. Limit sleeves are communicated with side walls of the upper butting sleeves, positioning rods are movably connected in the limit sleeves, the inner ends of the positioning rods are arranged in the upper butti