The invention relates to a seeder, in particular to a corn precise amount seeder. A finished machine comprises a machine frame, a hanging frame, a power driving mechanism, a knife shaft component, a fertilizing box, a fertilizing leg and a precise seeding leg, wherein contour wheels mounted on the two sides of the machine frame are also arranged on the finished machine; a miss-seeding alarming deice is arranged on the finished machine. Due to the fact that a machine body is reasonable in structural design, long in service life and low in failure rate, the operation efficiency is greatly improved; due to the fact that the contour wheels are arranged, equipment is uniform in fertilization and seeding depth and high in seedling emergence rate; due to the fact that the miss-seeding alarming deice is arranged on the finished machine, a tractor operator can know the seeding state at any time, the seed discharging amount and the strain distance can be monitored in real time, stubbles left in the field are cleaned, zero tillage is realized, and multiple advantages, such as zero burning, environmental friendliness, preservation of soil moisture, timely seeding, energy conservation and consumption reduction are realized.