The invention relates to a multifunctional precise close-fitting device for a mobile phone and a preparation technology thereof. An existing mobile phone ring buckle, a mobile phone support and the like have some functional defects. The multifunctional precise close-fitting device is composed of a shell, a storage part, a hanging base, and removable 3M glue; the shell comprises a surface cover anda bottom cover, and the top ends of the surface cover, a ring and the bottom cover are connected by a rotating shaft connecting piece; the rotating shaft connecting piece is composed of a bolt and apolyacetal pom sleeve coated outside the rotating shaft connecting piece, and a special clamp assembly is produced, so that a comfortable hand feeling is achieved when the surface cover or the ring isrotated; a nail beautifying machine is embedded at the bottom of the back of the surface cover; a circular boss is arranged at the upper part of the bottom cover; the inner cavity of the boss is provided with a magnetic ring, a non-slip mat and a magnetism-increasing shielding iron sheet in an embedded way; the lower part of the bottom cover is provided with a cavity storage part, and the insidethereof is provided with a TF card, an ejection pin, an SIM and the like; the bottom part of the bottom cover is provided with a magnet A and a magnet B; the removable 3M glue is pasted on the back ofthe bottom cover; the upper part of the back of the bottom cover is provided with the hanging base; and removable double-sided adhesive is pasted on the back of the hanging base. The production technology comprises: die sinking the surface cover, a bottom plate and the ring, die sinking an accessory, and performing assembly manufacturing.