A hard disk supporting structure is provided. The hard disk supporting structure includes a hard disk rack, a telescopic connecting rod, and a motor. The hard disk rack is for disposing at least one hard disk. An end of the telescopic connecting rod is connected to a rear end of the hard disk rack. The motor is connected to the other end of the telescopic connecting rod through a transmission mechanism; the motor drives the telescopic connecting rod to extend or retract through the transmission mechanism, to drive the hard disk rack to move back and forth. The present disclosure can automatically move the hard disk rack back and forth through a structure with automatic telescopic function, which saves labor, and improves efficiency.