The invention provides an electric connector for electric tools and apparatus. The electric connector includes a rotation springback type connection head and a rotation springback type connection seat. The connection head includes a guiding positioning groove and a metal touch piece A, and the connection seat includes a guiding positioning boss on hole wall, and a metal touch piece B. The engagement between the metal touch piece A and B accomplishes the electric connection. The invention has wide application, can ensure the security, prevent accidental electric shock, reduce arcing from occurring, have available materials and simple process, save a great deal of copper materials, as well as advantages of low cost, standardization, reasonable structure, simple operation and reliable connection performance. Especially under the case of the power on, the connector has self locking function so as not loose due to the outside force such as vibration shock, and has good electrical connection effect.