Fastening assembly

A fastening assembly, comprising:

• a first connecting piece comprising a round rod, a flange and a first threaded portion, the round rod being connected between the first threaded portion and the flange along a direction;
• a first locking piece configured to couple with the first threaded portion and abut against a first plate body towards the flange;
• a second connecting piece comprising a second threaded portion and a housing connected with the second threaded portion, the housing defining a space therein and being configured to abut against a second plate body, the first plate body and the second plate body sandwiching a third plate body therebetween, the flange being located in the space;
• a second locking piece configured to couple with the second threaded portion and abut against the second plate body towards the housing;
• and
• an elastic piece located in the space and connected between the flange and the housing along the direction, the elastic piece being at a side of the flange away from the second threaded portion,
• wherein when the first locking piece couples with the first threaded portion and abuts against the first plate body towards the flange, and the second locking piece couples with the second threaded portion and abuts against the second plate body towards the housing, the elastic piece is elastically contracted, such that the first plate body and the second plate body abut against two opposite sides of the third plate body.