A soda machine with a pressure adjustment fitting, which includes a carbon dioxide steel cylinder (1), a soda cylinder (2), a gas outlet controller fitted to the carbon dioxide steel cylinder and a gas inlet means (3) fitted to the soda cylinder (2) said gas outlet controller including a gas inlet body (4), a drive rod (5), a valve core (6) and a valve core seat (7), the gas inlet body (4) including a drive rod channel (41), a valve core seat chamber (42) and a gas outlet (43) the drive rod (5) and the valve core seat (7) being made of a single piece, and a limit disk being provided at a junction area of the drive rod and the valve core characterised in that it further includes a pressure adjustment valve (14), a top cover of said gas inlet means (3) having a gas outlet aperture (31), which communicates to the pressure adjustment valve (14) said pressure adjustment valve (14) including a valve housing (141), a drive rod (142), a limit nut (143), a gas block (144), an adjustment screw rod (145), an adj ustment - fixing sleeve (146), a spring (147) and a rotating knob (148), said valve housing (141) having a drive channel (15), a valve core chamber (16) and an adjustment rod channel (17) along a line a hollow gas block seat (18) being provided at a junction area of the drive channel (15) and the valve core chamber (16), a gas inlet hole (19) communicating to the hollow gas block seat (18), and a pressure relief hole (20) being provided on the valve core chamber (16) said drive rod (142) slidably engaging and hermetically sealing the drive channel (15), a guide rod at a base of the drive rod (142) slidably engaging a central threaded hole of the limit nut (143), and a mandrel at a top of the drive rod (142) extending into the hollow gas block seat (18) with clearances fit the gas block (144) slidably engaging the valve core chamber (16), and the gas block (144) engaging the hollow gas block seat (18) the adjustment screw rod (145) slidably engaging and hermetically sea
