We developed the screen split monitor for network separation in order to prevent the hack and enhance the network security. The users can connect 2 PCs to our monitor and the users can use ONE monitor with 2 PCs with only one mouse and one keyboard. The users can easily switch one PC to the other PC by pushing few keys on the keyboard. All cables and wires will be connected to our monitor except power cables of PCs. Our screen split monitor brings easy connection, and simple solution for network security to the users.