Abstract: A set of positioning component for fast positioning of a portable electronic device taking advantage of the characteristics of magnetic adsorption and mutual ejecting, the component includes a housing with a first magnetic unit having multi-poles to be fixed on the back of the electronic device; and includes a supporting piece with a second magnetic unit having multi-poles, the multi-poles of the second magnetic unit are provided with contrary magnetic polarities relative to that of the first magnetic unit, so that the multi-poles of the first magnetic unit can be adsorbed onto the second magnetic unit, and the housing can be strongly adsorbed and positioned on the supporting piece from a special angular direction; when the housing does bias rotation for an angle, the first magnetic unit and the second magnetic unit reject and separate mutually with each other to render the housing to be fast detached.