Abstract: A receptacle capable of warning overloading includes a receptacle main body and a protect device. The receptacle main body transmits a power source to an electric product while a plug of said electric product being inserted to the receptacle main body. The protect device is attached to the receptacle main body. It is characterized in that the protect device further comprises a detect circuit for detecting an amperage, and a warning component for receiving a signal coming from said detect circuit and converting the signal to a warning sound, a warning flash light or a numerical value. Thus, when the output end of the receptacle has an abnormal current overload, the user is notified to be aware of the problem of overloading.