The utility model relates to a nursery stock growth auxiliary device. The protective net comprises a first protective net and a second protective net arranged on the outer side of the first protectivenet in a sleeving mode. The upper end of the second protective net is fixedly connected to the outer side of the first protective net; a plurality of sponge protection pieces are arranged between thefirst protection net and the second protection net, net holes of the first protection net and net holes of the second protection net are formed in a staggered mode, the outer side of the first protection net and the outer side of the second protection net are wrapped with cellucotton layers, and the outer sides of the cellucotton layers are wrapped with protection cotton pieces. The first protective net and the second protective net can completely wrap the roots of plants when the roots of the plants are sleeved. The sponge protection piece between the two layers of protection nets has certain water storage performance, certain moisture can be provided for the plant roots while the roots are protected, the plant roots are kept wet, and therefore the survival rate of nursery stocks is increased.