Polypropylene and application thereof, and method and device for continuously preparing polypropylene

The invention relates to the technical field of polymers, and discloses polypropylene and application thereof, and a method and a device for continuously preparing polypropylene. The method comprises the following steps: (1) in the presence of a catalyst I, introducing a first monomer composition into a first reactor, and carrying out a first polymerization reaction to obtain a first material flow; (2) in the presence of a catalyst II, introducing the first material flow and a first part of a second monomer composition into a second reactor, and carrying out a second polymerization reaction to obtain a second material flow; (3) introducing the second material flow and a second part of a second monomer composition into a first gas phase reactor, and carrying out a third polymerization reaction to obtain a third material flow; and (4) introducing the third material flow and a third part of a second monomer composition into a second gas-phase reactor, and carrying out a fourth polymerization reaction. The polypr