An optical disc drive having a tray moved by the spindle motor is disclosed. The optical disc drive at least comprises a chassis, a tray, a spindle motor, a transmission chain and a coupling apparatus. The tray is mounted on the chassis for carrying a disc. The spindle motor is used for rotationally driving the disc. The transmission chain is used for moving the tray. The coupling apparatus selectively couples the transmission chain and the spindle motor. When the coupling apparatus is started, the transmission chain is coupled to the spindle motor, and the power generated from the spindle motor is transmitted to the tray through the transmission chain, so as to power the movement of tray for in-and-out of the optical disc drive. Thus, the invention does not require a conventional tray motor, so as to decrease the production cost.