Flat three-core flat plug

The utility model discloses a flattened three-core flat plug, which comprises a lower shell and an upper shell buckled at the top end of the lower shell, one end of the upper shell is fixedly provided with a front end cover, the bottom end of the front end cover is buckled with a front pin seat, the top end of the front end cover is embedded with a sealing cover, and the front pin seat is buckled with a rear pin seat. A live wire pin and a part pin are inserted into the two sides of the bottom end of the front pin base respectively, and a thread lifting structure used for tensioning the live wire pin and the part pin upwards is installed in the front pin base. According to the utility model, good contact between the plug shell and the live wire pins and between the plug shell and the part pins is ensured, contact resistance is reduced, the pins and the lead are stably connected, loosening or falling off between the pins and the lead is avoided, the possibility of arc discharge is further reduced, and the safe