The present invention discloses a rotation-type compressor bottom cover structure, wherein the bottom of the bottom cover is formed by smoothly connecting a convex ring curved face with a curvature radius R1 of 205-215 mm and a convex curved face with a curvature radius R2 of 20-40 mm, in which the convex curved face with the curvature radius R2 corresponds to a chordal length D of 40-60 mm. In accordance with the present invention, by increasing the natural frequency of the bottom cover and the modal number, the vibration between the bottom cover and the antapical horn, housing is reduced and the objective of noises reducing is achieved. |