The utility model belongs to the technical field of high performance liquid chromatographs, and discloses a high performance liquid mobile phase inlet filter protection device which comprises a
solvent bottle cap, a straight
triangular prism protection sleeve arranged below the
solvent bottle cap, and an upper cover arranged outside the straight
triangular prism protection sleeve through a hinge, the straight
triangular prism protective sleeve and the upper cover are both made of transparent acrylic materials, through the design of the straight triangular
prism protective sleeve and the upper cover, when a mobile phase needs to be added or replaced, an operator opens the upper cover and holds the
solvent bottle cover by hand to enable the inlet filter to be aligned with the opening and stably insert the solvent bottle cover, and in the process, the solvent bottle cover is opened. The high-performance
liquid phase inlet
pipe and the inlet filter are always located in a
closed space of the straight triangular
prism protective sleeve, the protective sleeve effectively isolates dust, particles and other pollutants in the external environment, a
physical barrier is formed, the risk that the filter is polluted is greatly reduced, and therefore the cleanliness of the filter is guaranteed, and the service life of the filter is prolonged. The stability of an instrument sampling
system and the accuracy of an analysis result are maintained.