A radio frequency yarn module includes a first flexible substrate, a radio frequency assembly, and a first packaging adhesive. The first flexible substrate is strip shaped and has a thickness ranging from 40 μm to 60 μm. The radio frequency assembly is disposed on the first flexible substrate and includes a first conductive layer, a second conductive layer, and a radio frequency chip. Each of the first and the second conductive layers is disposed on the first flexible substrate and has a thickness ranging from 3 μm to 10 μm. Extending paths of the first and the second conductive layers are respectively same as extending paths of a first and a second portions of the first flexible substrate. The radio frequency chip is disposed on the first conductive layer and the second conductive layer. The first packaging adhesive covers the radio frequency assembly.