The invention discloses a potted plant seedling cultivation auxiliary device. The potted plant seedling cultivation auxiliary device comprises supporting legs, a motor, a first conveyor belt, a material storage housing, a roller, a connection rack, a blanking plate, a vibrating motor, a first electric push rod, a first push plate, a second electric push rod, a second push plate, a plantation pot,a support frame, a second conveyor belt, a third electric push rod, a conical head, support legs, a third conveyor belt, a fourth electric push rod, a fifth electric push rod, a clamping plate, a clamping groove, a fixing column, and an accommodation plate. The potted plant seedling cultivation auxiliary device is reasonable in structure, and novel in design, is capable of realizing material automatic filling of plantation pots, avoiding artificial material filling, reducing labor intensity, ensuring that the material amount in plantation pots is equal, increasing material filling efficiency,is convenient to use. In applications, perforating of filled plantation pots is realized, it is convenient for plantation of seedlings by workers, plant seedling plantation efficiency is increased, and the potted plant seedling cultivation auxiliary device is convenient to use.