The present invention relates to a wall-mounted screen bracket for wall-mounted screen and bracket system, comprising a screen bracket main body and a tray, the tray is arranged on the screen bracket main body, an extension socket installation structure and a threading opening are arranged on the tray, the extension socket is arranged and fixed in the extension socket installation structure, and the power cord of the extension socket is connected with the outside world through the threading opening. The present invention is also concerned with a wall-mounted screen bracket system, which includes the wall-mounted screen bracket and an extension socket arranged on the extension socket installation structure. The advantageous effects of the present invention are as follows: solving the problem of random arrangement of the extension socket that supplies power to the screen and high potential safety hazards, and improving the appearance of the screen bracket by arranging an extension socket installation structure on the screen bracket, and an extension socket can be arranged on the above-mentioned wall-mounted screen bracket.