The invention belongs to a mobile phone signal shielding device. Based on technologies of an existing mobile phone signal shielding device, the device is installed in a driving cab with the help of existing sensing, braking and other auxiliary systems of the automobiles and using high-precision integration between microwave transmission equipment such as wireless communication, Bluetooth, infrared, radar and the like and the automobiles under the premise of not affecting safe driving of a driver, and mobile phone signals within a small range of 0.5 square meter around the driver are shielded. Safe driving of automobiles is managed and controlled through the method, and occurrence of distracted driving behaviors of the driver is reduced. On the basis of functions and characteristics of an existing mobile phone signal shielding device, the mobile phone signal shielding device is additionally provided with a function that a mobile phone of the driver is shielded only when the automobile is in a running state, and that the mobile phone returns to normal automatically when the automobile stops. The shielding range is small and calculated by millimeter, thereby not influencing passengers in the automobile to use mobile phones. The mobile phone signal shielding device for the automobile driver is a great innovation for traffic administrators, and has positive practical significance for reducing occurrence of traffic accidents.