The invention provides a device for conveying a PCB between two parallel production lines. According to the machine, supporting legs support a half-arc-shaped supporting plate, and the outer edge of the supporting plate extends upwards to form a baffle plate; a speed reducer is fixedly arranged on a supporting seat, an output shaft of a motor is connected with an input shaft of the speed reducer through a coupler, and an output shaft of the speed reducer is arranged on a rotating shaft in a sleeving mode; a rotating plate is fixedly arranged on the rotating shaft, a pulley is arranged under the other end of the rotating plate, the lower portion of the pulley is supported by the supporting plate, and a PCB conveying device is arranged on the supporting plate; further, a sliding groove is formed in the supporting plate along the rolling track of the pulley; and more preferably, the PCB conveying device is a transmission mechanism with a motor driving a belt wheel and a belt, and further,a limiting air cylinder is arranged at one end of the PCB conveying device.