Test tube device capable of conveniently removing milk fat and rapidly measuring milk fat content

The invention discloses a test tube device facilitating milk fat removal and rapid measurement of milk fat content, the test tube device comprises a cover part, an inner tube, a first outer tube and a second outer tube, the cover part can seal the top end of the inner tube, the bottom end of the inner tube is connected with a liquid discharge tube, the liquid discharge tube is provided with a filter pore plate, and the filter pore plate is provided with a plurality of filter pores; the top end of the first outer pipe is fixedly connected with an annular plate, the annular plate is connected with an annular cylindrical surrounding plate, the surrounding plate is provided with a first internal thread, and the outer side wall of the inner pipe is provided with a first external thread matched with the first internal thread; a through hole is formed in the circular ring plate; the first outer tube is internally provided with the mounting plate, and the mounting plate is connected with the first outer tube through