Precise seed taking device capable of quickly replacing seed taking disc

The precise seed taking device comprises a rack, an air chamber is arranged on the rack, the open end of the front end of an air cavity of the air chamber is closed through the seed taking disc, a transmission shaft is rotationally arranged in the center of the air chamber, and the seed taking disc is installed on the transmission shaft through a seed disc replacing mechanism; the seed disc replacing mechanism comprises an inner adjusting cylinder, an extrusion sheet, an outer adjusting cylinder and an adjusting part, the inner adjusting cylinder and the outer adjusting cylinder are sequentially arranged on the transmission shaft in a sleeving mode from inside to outside, a first limiting flange is arranged at the front end of the inner adjusting cylinder, a second limiting flange is arranged at the front end of the outer adjusting cylinder, and the extrusion sheet and the seed taking disc are detachably arranged on the inner adjusting cylinder in a sleeving mode; the first limiting flange, the extrusion shee