The utility model discloses a computer chair with adjustable armrest height, including the seat that rotates, bedplate, seatpad and back, the upper end of rotating the seat is fixed in at the diapire middle part of bedplate, lower extreme vertical fixation in the rear end of bedplate of back, and the seatpad is fixed and is laid on the bedplate its characterized in that: the lateral wall of back in the lower part pass through half handrail on the bolt fastening, the front end of half handrail passes through the backup pad to be fixed at the lateral wall middle part of bedplate, is equipped with the lift handrail in the front portion of half handrail, the track inslot of the one end card income backup pad that lift handrail and half handrail touched mutually. This computer chair with adjustable armrest height can not only can make computer chair handrail be less than the desk keyboard through the altitude mixture control of lift handrail and take out the plate height degree through rotating the height of adjusting the seat moreover to do not influence the keyboard and take out the board and take out, simultaneously, can not change the suitable operation distance of people and computer screen yet, the stepless speed regulation and control system of a construction elevator is simple in structure and convenient to use.