The present invention relates to the technical field of LED decorative lighting, and particularly relates to an LED lamp string having a selectable light emitting mode. The LED lamp string comprises a power line positive electrode, a power line negative electrode, a controller, an input positive electrode of the lamp string, an input negative electrode of the lamp string, a lamp string group and a conductive connection wire. In the present invention, one or more types of LEDs having a selectable light emitting mode from multiple light emitting modes are selected according to a customer demand, and synchronous control of one single type of LEDs on the multiple light emitting modes thereof is realized, thus creating a variable and diversified light emitting effect, and meeting the light emitting customization requirement for users.