An electrical connector device that connects a light source board and a driver board of an LED light electrically. The electrical connector device includes a connector board. The connector board is related to the conductive pins. The connector board is fixed on the light source board and connected to the light source board electrically through the conductive pins. The electrical connector device also includes two electrical connector pieces. Each electrical connector piece includes a whole set for the connection portion and the resistance portion. One end of the connection portion is fixed on the connection board. The resistance portion of the electrical connector piece closes to each other to become an elastic clipping portion and includes the bent and fastening structure. After bending, the fastening structure touches the other end of the connection portion to be fixed on the connection board. The electrical connector device owns the advantages of simple structure and easy to be assembled automatically.