The invention discloses an electrical outdoor-screen connecting device, which comprises a display module, wherein both edges of the display module are respectively provided with an inserting slot, a control module is arranged on the display module, a wire-separating module, an integrated-control circuit board and a switching power supply are arranged in the control module, the edges of the control module are provided with plugs matched with the inserting slots, the integrated-control circuit board and the switching power supply are electrically connected with the plugs through the wire-separating module, and the plugs are preferably D-type interfaces to ensure that the control module can be correctly installed and avoid reversed installation; through the reasonable design of the connecting device, convenient and simple disassembly and assembly are realized by utilizing the integrated-designed control module through the inserting slots, so that not only is the installing efficiency greatly improved, the installation can be finished by only installing the control module on the display module through the inserting slots, the integrated control for the display module is realized by utilizing the integrated-control circuit board and the switching power supply, and an original complicated wiring process is saved, but also the electrical outdoor-screen connecting device is also easier to maintain and has a good practical value.