An electromagnetic interference (EMI) shielding device and manufacturing method thereof are provided. The EMI shielding device includes at least one ferrite material outer layer, a first and a second electrodes within the ferrite material outer layer, and a positive temperature coefficient resistor (PTCR) core layer sandwiched between the first and the second electrodes in the ferrite material outer layer. The first and the second electrodes extend to two ends of the ferrite material outer layer respectively.