The invention discloses a gear shifting and parking integrated mechanism of an automatic transmission. The gear shifting and parking integrated mechanism comprises a motor, a shifting fork, a joint sleeve, an output shaft and a transmission mechanism, wherein the motor is fixedly connected with the shifting fork through a transmission part, the shifting fork is detachably connected to the joint sleeve, the shifting fork drives the joint sleeve to move up and down, the output shaft is sleeved with a gear hub, the gear hub is sleeved with a spline hub, the spline hub is detachably provided withthe joint sleeve, the output shaft is sleeved with the transmission mechanism, the transmission mechanism is located above the joint sleeve, a second joint tooth is arranged below the joint sleeve, abase is arranged at the bottom of the output shaft, the output shaft sleeves the base through a bearing, and the second joint tooth is connected with the base. According to the gear shifting and parking integrated mechanism of the automatic transmission, three actions of shifting, neutral gear parking are simultaneously completed by sharing one motor, and the gear shifting and parking integrated mechanism is simple in structure, small in occupied space and low in cost; and the gear shifting parking action can be quickly and conveniently completed, the gear shifting and parking efficiency can be improved, and the stability and the safety of automobile running are ensured.