The invention discloses a middle frame assembly, electronic equipment and an assembling method thereof. The middle frame assembly comprises a middle frame, an antenna and a back cover; the middle frame comprises a middle plate and side plates; the middle plate and the side plates are connected to form an accommodating space; multiple sockets for running through the side plates are formed in the side plates; the antenna comprises a main body part and connecting parts in an integrated structure; the main body part is positioned on one side, deviated from the accommodating space, of the side plates, and the connecting parts are buckled on the middle plate through the sockets; the back cover comprises a cover plate and a stop part in an integrated structure; and the cover plate is connected with the side plates to enable the stop part and the middle plate to fix the connecting parts from the two opposite sides of the connecting parts. By virtue of the mode, the manufacturing process of themiddle frame assembly can be simplified and the production cost can be lowered.