The invention relates to a fixing assembly and an electronic device. The fixing assembly comprises a first fixing part and a second fixing part, wherein the first fixing part comprises a first body and a hollow clamping sleeve which is arranged on the first body; the top of the hollow clamping sleeve is provided with a first clamping surface and a second clamping surface which have a height difference; the second fixing part comprises a second body and a first clamping hook and a second clamping hook which are arranged on the second body; when the first fixing part is in clamped fit with the second fixing part based on first tightness, the first clamping hook is matched with a first clamping surface so as to fix the first fixing part and the second fixing part; and when the first fixing part is in clamped fit with the second fixing part based on second tightness, the second clamping hook is matched with a second clamping surface so as to fix the first fixing part and the second fixingpart. The fixing assembly can adjust the tightness between fixing assemblies.