The utility model discloses a scriber of a rape seeder. The seeder comprises a spring, a pin shaft, a square shaft sleeve, a square shaft, a transverse pipe, a marking knife, a cross beam, a rotatingshaft sleeve, a fixed shaft sleeve and a seeder rack, steel plate type spring, bending into an arc, the spring is fixed on the fixed shaft sleeve by a bolt through the hole; the transverse pipe and the fixed shaft sleeve are welded together; the transverse pipe is inserted into a sleeve on the cross beam; the rotating shaft sleeve and the square shaft sleeve are welded together; the rotating shaftsleeve is connected with the fixed shaft sleeve through a pin shaft; rotatable, the height of the marking knife is adjusted by adjusting the position of the square shaft; certain depth can be markedin soil, the position of the transverse pipe can be adjusted to adapt to the row spacing of oilseed rape seeding, one or two marking knives can be installed, a spring protection mechanism is providedfor the marking knives when the marking knives encounter hard objects, and the device has the advantages of being good in positioning precision, not prone to damage, accurate in row spacing during seeding, adjustable in row spacing width and adjustable in marking depth.