The invention belongs to the technical field of medical treatment, and particularly relates to a seat for gynaecology and obstetrics examination and a use method.The seat comprises a seat frame, a backrest, a headrest and a switch, the backrest and a cushion are pasted to the top side face of the seat frame, the headrest is installed at the top of the seat frame, and the switch is installed on the side edge of the seat frame; the fixed legs are installed below the bottom of the seat frame, under the cooperation of the piston rod, the sliding shaft can be pushed, in the pushing process of the sliding shaft, the sliding shaft moves in a sliding hole of the swing rod, the swing angle of the swing rod is changed, the position of the balance weight ball is changed, the overall gravity center is adjusted, and the use safety can be guaranteed. The seat is prevented from toppling, the use safety is improved, the structure is concentrated, the overall space occupation is reduced, when the adjusting angle of the seat frame is too large, the electrode ball makes contact with the first electrode plate, the motor stops working, the alarm is powered on, an alarm can be given out in time, medical workers are reminded to stop excessive working, and the use safety is guaranteed.