This disclosure provides a communication device and a manufacturing method thereof. The manufacturing method of the communication device includes the following steps: providing a first dielectric layer, wherein the first dielectric layer includes a first region and a second region, and the first dielectric layer has a first surface and a second surface opposite to the first surface; providing a second dielectric layer; combining the first dielectric layer and the second dielectric layer with a sealing element, so that the sealing element is disposed between the first surface of the first dielectric layer and a third surface of the second dielectric layer; after combining the first dielectric layer and the second dielectric layer, thinning the second surface of the first dielectric layer; and disposing a first communication element on the first surface of the first dielectric layer in the first region.