The utility model discloses a network cable connection protective device which includes a box body. The top of the box body is provided with a cover body. Network cable fixing beam clamps are symmetrically arranged on inner walls of the box body. The network cable fixing beam clamps are fixed on the inner walls through bolts. Two side walls which are corresponding to the inner walls, on which the network cable fixing beam clamps are arranged, in the box body are each provided with a penetrating hole. A rubber pad is arranged on each of the penetrating holes. The two ends of the box body are each provided with a fixing rod. The internal part of the fixing rod is an empty cavity. A slide rod is arranged in each of the fixing rods. One end of each slide rod is connected with a chuck, and the other end is exposed outside a corresponding fixing rod. The network cable connection protective device also includes fixing seats. Insert holes corresponding to the slide rods in size are arranged in the fixing seats. The beneficial effects of the network cable connection protective device are that the device is capable of effectively preventing man-made damages and damages of external forces such as wind and the like so that the security of network cable connection is guaranteed, connection between network cables is improved and network faults caused by network cable disconnection are prevented.