Abstract: A safety lock for portable computers includes a first magnetic body and a control unit that are respectively mounted to a first portion and a second portion of a portable computer that respectively carry a display screen and a keyboard. The control unit forms an accommodation chamber and receives therein a second magnetic body. The accommodation chamber has an opening. The second magnetic body is controlled by a force application member for selective movement. Normally, the two magnetic bodies are separated by a distance to induce a magnetic attraction. When the force application member is operated to move the second magnetic body to correspond in position to the first magnetic body, an opposite-polarity repulsion is induced, which generates an upward driving force on the first portion thereby resulting in a released condition, allowing a user to lift up the display screen for use in an effortless, easy, and quick manner.