The invention discloses a portable water purification cup. The portable water purification cup comprises a water storage cavity, a filtration device and a water purification cavity. A cup lid is arranged at the upper end of the water storage cavity. The water storage cavity is communicated with the filtration device in a detachable and movable mode. The filtration device is communicated with the water purification cavity in a detachable and movable mode. A gas pressurization device is arranged on the cup lid. The lower end of the water purification cavity serves as a cup bottom. The filtration device refers to a composite filter element, and comprises at least three filter materials. The first filter material is a PP cotton filtration layer, the second filter material is a magnetizing or infrared material layer, and the third filter material is a nano-filtration membrane, RO membrane or hollow filter ultrafiltration membrane. Compared with the prior art, the portable water purification cup has the advantages that clean and safe purified water is provided timely by means of various water sources; the portable water purification cup is compact in structure and small in size, has a heating function, and is convenient to carry out, applicable to travelling, picnic and outdoor working and living and quite convenient to use.