The invention discloses a platinum/attapulgite nano supported catalyst, and a preparation method and an application thereof. A carrier of the catalyst is attapulgite (ATP), and an active component is Pt nanoparticles with the average particle size of 4-6 nm. The average mass fraction of Pt in the catalyst is about 0.5%-1%, and the residual component of the catalyst is ATP. The preparation method comprises the steps: firstly adopting an acid to treat mineral impurities on the surface of ATP, and drying for standby application; with polyvinylpyrrolidone and other polymers as stabilizers, adopting reducing agents to reduce chloroplatinic acid, and thus obtaining a Pt sol; adding the treated ATP into the Pt sol, stirring, filtering, drying, and thus finally obtaining the Pt/ATP nano supported catalyst. The catalyst prepared by the method has quite high catalytic activity on reduction of nitrophenol into aminophenol.