The invention provides a guide rail type LED light bar socket. The guide rail type LED light bar socket comprises an upper shell, a lower shell, a negative terminal and a positive terminal, wherein the upper shell is connected with the lower shell, a negative wire passing hole allowing a negative wire to pass through and a positive wire passing hole allowing a positive wire to pass through are formed between the upper shell and the lower shell, an installation cavity is defined between the upper shell and the lower shell, both the negative terminal and the positive terminal are arranged in the installation cavity, a negative impaling protrusion part is arranged at one end of the negative terminal, and a negative contact spring is arranged at the other end of the negative terminal. The invention further provides a guide rail type LED light bar extension socket connector. The guide rail type LED light bar socket and the guide rail type LED light bar extension socket connector have the advantages that the negative wire and the positive wire do not need to be cut into sections, operation such as welding is not needed, loss is small, consistent power supply on the head and on the tail can be achieved, luminance consistency is high, wiring management is convenient, installation is easy, insertion is convenient, and plug and play of an LED light bar is achieved.