The invention relates to a lactation-promoting device, in particular to an automatic lactation-promoting device special for puerperae of the obstetrics and gynecology department. The invention aims atproviding the efficient automatic lactation-promoting device special for puerperae of the obstetrics and gynecology department. In order to solve the technical problems, the following technical scheme is adopted: the automatic lactation-promoting device comprises first brackets, a second bracket, a motor, a first cam, a first support rod, an extruding box, an extruding plate, a guide rod, a firstspring, a first baffle plate, a first suction pipe and the like, wherein the two first brackets are arranged on the horizontal plane, the second bracket is fixedly connected to the left side of the first bracket on the right side, the motor is fixedly connected to the second bracket, and the first cam is connected to an output shaft of the motor in an interference manner. The automatic lactation-promoting device has the function of promoting the lactation of puerperae, realizes the rapid lactation promoting function, and also realizes the functions of massaging the breasts and improving the lactation-promoting efficiency.