Connecting piece of automotive chassis and heat treatment process thereof

The invention discloses a connecting piece of an automotive chassis and a heat treatment process thereof. The connecting piece of the automotive chassis and the heat treatment process thereof comprise a main body and a heat treatment process. Three circular through holes are formed in the lower part of the main body, namely a first through hole, a second through hole and a third through hole, wherein a square groove is formed between the first through hole and the second through hole. A barrier strip is arranged at the upper part of the main body. The heat treatment process has the following characteristics that after being heated to austenization, the connecting piece is dipped in an appropriate quenching medium for cooling at a quick speed. The The connecting piece has enough high tensile strength to resist elongation, snap, thread slipping and abrasion, has higher fatigue resistance and impact toughness to resist fatigue and impact rupture, and can be well applied to the automotive chassis.