Abstract: A battery loading and unloading structure is disclosed, including a main body having a battery receiver defined by a bottom and sidewall, the bottom being provided with a resilient ejector, the sidewall being provided with a battery retainer that is located in a moving track of an engaging member and laterally moves upon an applied force. The structure further includes a resetting member to reset the battery retainer. When a battery is loaded, the battery retainer automatically moves laterally to avoid blocking the engaging member in response to the force applied thereon, and resets to catch the battery after the battery has been loaded into place. When the battery is unloaded, the resilient ejector can eject the battery by moving the battery retainer to the sides to disengage from the engaging member.