A trenching apparatus for agricultural planting. The trenching device for agricultural planting comprises: a support frame (1)； a mounting mechanism (2)； a crushing mechanism (3)； a trenching mechanism (7)； a support mechanism (5), wherein the support mechanism (5) comprises a pulley (51), a support plate (52), sawteeth (53), sliding grooves (54), a first gear (55), and a second gear (56), the sliding grooves (54) are symmetrically disposed in the support frame (1), the sliding grooves (54) are slidably connected to the support plate (52), the bottom surface of the support plate (52) is rotatably connected to the pulley (51), a side wall of the support plate (52) is uniformly provided with the sawteeth (53), the first gear (55) and the second gear (56) are rotatably connected in the sliding grooves (54), the second gear (56) is meshed with the first gear (55), and the second gear (56) is meshed with the sawteeth (53)； a rocker rod (4), which is fixedly connected to the first gear (55) and is rotatably connected to the support frame (1)； and a limiting mechanism (6), which is engaged with the first gear (55). The trenching apparatus for agricultural planting is able to prevent contact between a blade (33) and the ground when not in use and protect the blade (33).L'invention concerne une trancheuse pour plantation agricole, qui comprend : un cadre de support (1)； un mécanisme de montage (2)； un mécanisme de broyage (3)； un mécanisme de creusement (7)； un mécanisme de support (5). Le mécanisme de support (5) comprend : une poulie (51)； une plaque de support (52)； des dents de scie (53)； des rainures de coulissement (54)； un premier engrenage (55) et un second engrenage (56). Les rainures de coulissement (54) sont disposées en symétrie dans le cadre de support (1) et son reliées coulissantes à la plaque de support (52). La surface inférieure de la plaque de support (52) est reliée rotative à la poulie (51) et une paroi latérale de la plaque de support (52) est munie uni
