Sickbed extension set convenient to mount and dismount and system

The utility model discloses a sickbed extension set convenient to mount and dismount and a sickbed extension system convenient to mount and dismount. The sickbed extension set comprises a display screen, a middle frame, a rear cover, a mainboard and an elastic sheet, the display screen is arranged on the middle frame, is electrically connected with the mainboard, and is used for displaying a display signal sent by the mainboard, generating a first electric signal through touch and transmitting the first electric signal to the mainboard; the middle frame is detachably connected with the rear cover, and the mainboard is arranged in the middle frame; the mainboard is arranged below the display screen, the elastic pieces are oppositely arranged on the two sides of the middle frame, the sides, close to the rear cover, of the elastic pieces are rotationally connected with the middle frame, the sides, close to the display screen, of the elastic pieces are elastically connected with the middle frame, and the sides, c