Abstract: A lamp holder for an LED string light includes a lamp housing, an LED lighting module, a plug, and a socket. An open end of the lamp housing is pre-sintered with an encapsulation layer. The LED lighting module is disposed in the lamp housing, and has a cathode pin and an anode pin extending out from the encapsulation layer. Because the LED lighting module is pre-encapsulated in the lamp housing, when installed, only the LED lighting module and the plug need to be assembled so as to complete the assembly of the lamp housing, the LED lighting module and the plug. This reduces the assembly steps for production.