embodiment of the stirring disk 40 a the through holes 411 a of the panel 41 a are radially arranged on the panel 41 a the lower sidewall 42 a has an annular frame 422 a and multiple connecting frames 423 a the annular frame 422 a is disposed below and around the panel 41 a the connecting frames 423 a are separately arranged around and are disposed between the annular frame 422 a and the panel 41 a each connecting frame 423 a is arc shaped and has two ends respectively connecting to the annular frame 422 a and the panel 41 a each lower through hole 421 a is defined between two adjacent connecting frames 423 a the stirring ribs 43 a are formed on the lower surface of the panel 41 a with reference to fig5 to 7 in a second embodiment of the stirring disk 40 b each through hole 411 b of the panel 41 b is elongated and extends radially on the panel 41 b the lower sidewall 42 b is perpendicular to the panel 41 b the lower through holes 421 b of the lower sidewall 42 b are formed through the lower sidewall 42 b the stirring ribs 43 b are formed on the lower surface of the panel 41 b each stirring rib 43 b is a sheet the stirring disk 40 b further has multiple nets 45 b respectively mounted in the through holes 411 b of the panel 41 b and the lower through holes 421 b of the lower sidewall 42 b with further reference to fig8 in a.