A display screen assembly, a method for assembling display screen assembly and an electronic device are provided. The display screen assembly includes: a display screen having a display area and a non-display area surrounding the display area, a connector, a cover plate and a bracket. The connector includes a first joining portion, a second joining portion and a third joining portion. The first joining portion is coupled in the non-display area. The second joining portion is opposite to a side wall of the display screen. The third joining portion is fitted with a bottom surface of the display screen and corresponds to the non-display area. A lower surface of the cover plate is positioned to the top surface of the display screen and the first joining portion. The bracket includes a top portion joined to the bottom surface of the display screen and the third joining portion.