Abstract: A LED display screen includes a case, a LED display module and a front assembling system. The case has a front opening. The LED display module is received in the case via the front opening, including a supporting base, a LED display unit mounting in front of the supporting base, and a LED shade shading in front of the LED display unit. The front assembling system has a base channel, a display unit channel and a shade channel. The front assembling system includes a still member, a supporting member and a supporting member. The still member mounts behind the supporting base. The supporting member is provided on the case. The supporting member includes a body and a head. The body is inserted through the mounting hole to engage with the supporting member. The head is hidden inside the base channel to combine the LED display unit with the supporting base.