The invention discloses a novel reactor core filtration device used for the reactor core of a pressurized water reactor. The novel reactor core filtration device comprises: a device body (1), which consists of a spring accommodating part (10), a first pipe body (11) and a second pipe body (12) that are disposed in order and communicated; a pressure bar (2), which passes through the spring accommodating part (10) and the first pipe body (11), has a first end extending into the second pipe body (12) and fixedly equipped with two clamping spring pieces (21), and has a second end provided with anoperating handle (20), and is fixedly equipped with an abutting sheet (22) at the part accommodated in the spring accommodating part (10). The lower part of the second pipe body (12) is equipped withrelease holes (120) for penetration of the ends of the clamping spring pieces (21) and exposure of the outside of the second pipe body (12). The novel reactor core filtration device provided by the invention has the advantages of convenient installation and maintenance, good filtering effect, good safety, etc.