High flame retardant, strong pressure resistance, glass fiber reinforced plastic shell, adding flame retardant additives, and the shell can withstand super shock from inside and outside; safe and explosion-proof, the explosion-proof shell has an energy-relieving hole sealed with a silicone rubber sealing plug on one side, and the direction can be adjusted. Adjustment, such as the explosion of the intermediate joint of the cable, the sealing plug can quickly open the discharge energy to prevent damage to other cables or the surrounding environment; the flame retardant performance of the shell can also ensure that the internal flame is extinguished due to lack of oxygen.