Height-adjustable water drill drilling fixing device

The utility model relates to the technical field of water drill drilling construction equipment, and discloses a height-adjustable water drill drilling fixing device which comprises a supporting rod assembly and a fixing rod assembly, the supporting rod assembly comprises an outer pipe, an inner pipe and a positioning bolt, the inner pipe is sleeved with the outer pipe, a first through hole is formed in the outer pipe, and a second through hole is formed in the inner pipe; the adjustable base assembly comprises a supporting assembly, a bottom plate and a cushion block, the cushion block is arranged on the bottom plate, the supporting assembly comprises a base, the base is arranged on the cushion block, and a screw rod is vertically arranged on the base; and the water drill connecting assembly comprises a sleeve and a supporting pipe, the supporting pipe is perpendicularly connected to the sleeve, a plurality of third through holes are formed in the sleeve, a plurality of first nuts are connected to the suppor