The invention provides a light-emitting diode display module with adjustable size, comprising a plurality of light emitting units and at least one group of spacing adjustment mechanism. The spacing adjustment mechanism is a telescopic fence like structure or a grid telescopic fence like structure, a plurality of light emitting units are distributed at different positions on the construction member of the spacing adjustment mechanism, thus the spacing adjustment mechanism can cause the display module to be in different size modes after compression or stretching adjustment, the positions of a plurality of light emitting units are also changed, various image display effects are shown by light effects in different spaces, and occupying space of the display module with adjustable size is less when in storage and transportation, and display screen with specific size can be formed by coordination according to usage place.