The invention discloses a multifunctional rotary
tillage ditching combined seed and
fertilizer drill which comprises a rack, wherein a
fertilizer apparatus, a rotary
tillage ditching device and an auxiliary ditching device are arranged at the front part of the rack, and a sewing device, a ditching device and a ditching device height adjustment device are arranged in the middle of the rack; a suppressing earth covering device and a
ditch protection device are arranged at the rear part of the rack, and the
ditch protection device is connected with a ditching cutter and used for adjusting the
drainage ditch dimension according to the actual condition; a speed changer which is connected with an external
power output end is arranged on one side of the rack, and a
speed measurement wheel which is used collecting the
machine tool advancing speed is arranged at the rear part of the same side. The
ditch protection device comprises a ditch protection base plate, ditch protection side plates anda first square
pipe, the ditch protection side plates are arranged on the two sides of the ditch protection base plate, and the first square
pipe is fixed in the middle of the ditch protection base plate; the other end of the first square
pipe is connected with the rack, and each ditch protection side plate is connected with the ditch protection base plate by turnbuckles. According to the multifunctional rotary
tillage ditching combined seed and
fertilizer drill, rotary tillage, ditching, fertilizing, sewing and suppressing operation can be performed simultaneously during one-time operation.