The invention discloses a chair type intelligent electric auxiliary toilet seat and a control method thereof. The auxiliary toilet seat comprises a first electric switch, a second electric switch, a toilet seat, a backrest, a handrail, a bracket, a front telescopic pole, a back telescopic pole, a hinge, a screw, a fixing device, a servo motor, a pressure sensor, a displacement sensor and a digital computer. The servo motor is controlled to operate by the digital computer so as to provide assistance in standing up and sitting down. A chair body comprises the backrest, the bracket and the handrail; through adoption of user-friendly design, the user can sit on the toilet seat comfortably and safely. The chair type intelligent electric auxiliary toilet seat disclosed by the invention is suitable for the aged having troubles with low backs and legs, can effectively help the aged to use the toilet independently, can prevent the aged from fainting, can provide safety protection for the aged after sudden fainting and can avoid accidental injuries of the aged. The chair type intelligent electric auxiliary toilet seat disclosed by the invention has the advantages that the applicability is wide and the dimension can be adjusted according to corresponding toilets and can be placed on various toilets.