The invention relates to a television box for improving wireless signal transmission efficiency. The television box for improving the wireless signal transmission efficiency comprises a printed circuit board (PCB) small board and a PCB big board, wherein the PCB small board is provided with an antenna, a clear zone and a radio frequency (RF) chip, the PCB big board comprises data transmission interfaces, a central processing unit (CPU) and an internal storage, the PCB big board and the PCB small board are connected with each other in an electric mode, a ground terminal base of the data transmission interfaces is connected with a ground terminal base of the PCB big board, at least one data transmission interface is provided with a grounded metal shell, the PCB small board is provided with at least one grounded copper sheet, and the grounded copper sheet is connected with a ground terminal base of the PCB small board. When the PCB small board is connected with the PCB big board, the grounded copper sheet contacts the grounded metal shell of the data transmission interfaces in an electrical connection mode. A shielding frame needs not further arranging on the PCB big board, the television box for improving the wireless signal transmission efficiency can prevent a main circuit module from producing electromagnetic interferences to the antenna, improves the wireless signal transmission efficiency, meanwhile facilitates routing of PCB boards, and enables products to be in miniaturization.