The invention discloses a convenient three-dimensional safety protection grid comprising a fixed frame and a mesh grille made of steel wire ropes, wherein the mesh grille is installed inside the fixedframe; the safety protection grid also comprises a power supply, a controller, a relay, an alarm, an infrared transmitter and an infrared receiver that are installed on the fixed frame; any steel wire rope in the mesh grille is connected to the relay, the relay is connected to the controller, and the controller is connected to the alarm and the power supply, respectively; the infrared transmitterand the infrared receiver are respectively installed at lower parts of the left and right sides of the fixed frame, and the infrared receiver is connected to the controller. The invention can effectively prevent irrelevant persons from entering dangerous areas to avoid accidents.