The invention discloses a temporary rearing method for kelp seedlings. The method is characterized by comprising the following steps: when summer seedlings of kelp grow to 1.5-2.5cm, cutting seedling curtains with the summer seedlings of kelp into seedling ropes which are 50-60cm; then spitting each of the seedling ropes into three branch seedling ropes, wherein the top ends of all the branch seedling ropes are connected to hanging ropes while the bottom ends of all the branch seedling ropes are connected to sinkers; and stabilizing all the branch seedling ropes at the depth of water 50-80cm for temporary rearing, and finishing temporary rearing when the average length of the seedlings reaches 20+/-2cm, and performing a seedling picking-out and splitting operation.