Micro-nano robot and preparation method and application thereof

The invention discloses a micro-nano robot and a preparation method and application thereof. The micro-nano robot comprises a functional layer and a magnetic layer which are arranged in a stacked mode. The functional layer comprises a functional substance and a photo-crosslinking polymer; the functional substance is arranged in the photo-crosslinking polymer; the functional substance is sodium alginate modified by fluorescent molecules or chitosan modified by fluorescent molecules; the magnetic layer includes a magnetic material. According to the micro-nano robot disclosed by the invention, a functional substance with a fluorescence characteristic is locked in a network structure formed by polymerization of a photo-crosslinking agent, and the micro-nano robot is endowed with a specific arc-shaped structure shape, so that the magnetic control micro-nano robot can realize rapid directional movement in a magnetic field; according to the invention, intelligent driving on a micro spatial scale can be realized, and