A lamp body used in a LED light string comprises: a light-emitting chip which is installed on the frame, a package colloid which is provided to cover the top of the frame, wherein a lamp holder which covers the two leads and a part of the wires is provided beneath the package colloid and forms an integral unit with the package colloid, two leads and wires, so that it is capable of eliminating the potential problem as water inleakage at the joint of the package colloid and the lamp holder, and the waterproof ability is greatly improved. Meanwhile, the process of assembling the package colloid to the lamp holder by hand can be cancelled, so that mass production by machine can be realized efficiently.