Polypropylene resin and preparation method thereof

The invention provides polypropylene resin and a preparation method thereof. The method comprises the following steps: polymerizing propylene serving as a raw material to obtain a polypropylene crude product; and purifying the obtained polypropylene crude product to obtain the polypropylene resin, the purification comprises the following steps: adding a polypropylene crude product into a composite solvent, fully contacting the polypropylene crude product with the composite solvent at 30-120 DEG C to form polypropylene slurry, then separating polypropylene from the composite solvent to obtain polypropylene powder, and drying the polypropylene powder to obtain the polypropylene resin. According to the bulk polymerization and deep purification process adopted by the invention, metal impurities and polypropylene oligomer are removed by using the organic composite solvent, and the produced resin product has lower ash content and higher isotacticity and can meet the requirements of high-end capacitors. 本发明提供了一种聚丙烯树