A multifunctional protective case for a tablet computer includes a front plate (110) with a sandwich structure (111), a holding plate configured to hold a back of the tablet computer and a supporting plate (130) connecting the front plate (110) and the holding plate (120) via a bendable portion (140) to support the tablet computer. A printed circuit board (112) with wireless router functionality is installed in the sandwich structure (111) in the front plate (110), therefore enabling the protective case with wireless router functionality. The printed circuit board (112) can be connected with an external wireless network card, and the tablet computer can get access to a cellular network once placed in the multifunctional protective case and connected to the printed circuit board.