The invention discloses a rotating wheel core-changing type filter with a blockage alarm function, which comprises a pipe body, slow flow grooves are formed in two ends of the pipe body, circulation grooves are formed in one sides, close to each other, of the two slow flow grooves, a filter groove is formed in the outer side wall of the pipe body, and a core-changing wheel is hermetically and rotatably mounted in the filter groove. A plurality of filter element holes are annularly formed in the core-changing wheel at equal intervals, an arc-shaped groove is formed in the position, located at the hole end of each filter element hole, of the core-changing wheel, two pressure dividing pipes are symmetrically inserted into the outer side wall of the pipe body, and a detector is installed on the outer side wall of the pipe body. According to the invention, a new filter core column can be quickly replaced and an old filter core column can be detached by rotating the core-changing wheel, theblockage state can be detected in real time through the pressure dividing pipe and a detection rod, the blockage can be timely alarmed through a radial piezoelectric pipe and an arc-shaped detection electric sheet, an external power supply is not needed for power supply, and the filter is more energy-saving and environment-friendly.