The invention discloses a waternut corm strong seedling culture medium and a waternut corm seedling field transplanting method. The waternut corm strong seedling culture medium comprises, by weight, 4-5 parts of MS culture medium dry powder, 30-40 parts of sucrose, 0.4-0.6 part of KNO3, 2-4 parts of (NH4)2SO4 and 800-1000 parts of deionized water. The waternut corm seedling field transplanting method includes the steps: unscrewing a tissue culture bottle cap for healthy and strong waternut corm seedlings cultured by the waternut corm strong seedling culture medium, performing environmental adaptation training in a culture room for 7 days and then removing the bottle cap, transferring the seedlings into an indoor environment, placing the seedlings in the indoor environment for 30 days, taking out the tissue culture seedlings from a culture bottle, changing water once every 5 days within 30 days, washing out the culture medium with clean water and transplanting the seedlings into a culture substrate; transplanting the waternut corm tissue culture seedlings surviving in provisional planting in the step (1) into a field. By the aid of the culture medium, the waternut corm tissue culture seedlings can generate root systems in the seedling strengthening process, independent rooting culture steps are omitted, and field transplanting survival rate can be increased by the field transplanting method.