Vacuum cup

The vacuum cup comprises a cup cover, a shell, an inner container and a bottom cover assembly, the inner container is arranged in the shell, a gap exists between the inner container and the shell, the lower end of the shell is open, the cup cover is detachably connected with the upper end of the shell, and the bottom cover assembly comprises a bottom piece, a spring, a bottom plug and a bottom plug upper piece. A through hole is formed in the middle of the bottom piece, an inserting barrel is arranged on one side of the bottom plug and penetrates through the through hole, the bottom plug upper piece is movably connected in the inserting barrel in an inserted mode, and the spring is movably arranged on the inserting barrel in a sleeved mode and located between the bottom plug upper piece and the bottom piece. During vacuumizing, the bottom plug and the bottom piece are separated through the spring, so that a closed vacuum space is formed between the shell and the inner container, vacuumizing operation is extre