The invention discloses a seeder capable of quantitatively seeding. The seeder comprises a seeder body, a sealing mechanism, a limiting mechanism, a pull rod, a first spring, a first limiting column,a second limiting column, a connecting rod, a shaft sleeve, a drill bit, a power mechanism, a quantitative mechanism, a quantitative sleeve, a metering box, material receiving grooves, material leaking holes, a first limiting groove and a second limiting groove. The seeder has the beneficial effects that the proper metering box is selected according to the size of seeds, then the quantitative sleeve is rotated according to the specific seeding quantity requirement, so that the material leaking holes with the required quantity correspond to the material receiving grooves in the metering box, seeds are quantified, the pull rod is loosened, and the first spring drives the first limiting column to reset, so that the metering box is limited; and then the shaft sleeve is screwed towards the seeder body, the shaft sleeve abuts against the connecting rod to move towards the metering box, so that the second limiting column limits the metering box, the connecting rod drives the metering box to rotate by 180 degrees under the action of the power mechanism, the seeds are poured into the drill bit, and seeding of the seeds is achieved.