The invention discloses a device for attaching and transplanting seaweed spores. The device comprises a support, wherein a plurality of spore attachment plates with small holes are arranged on the support, according to the device, the spore attachment plate is used as a carrier which is contacted with the seaweed spores floating on the sea water for the seaweed spores to attach and grow; and thenplates can be transmitted to a specific sea area so as to complete the transplanting task; and the small holes can be used for water quality and nutrient substances to exchange. The device for attaching and transplanting seaweed spores is simple in structure, easy in manufacturing, simple and convenient in operation and can be used as the carrier for attaching and transplanting seaweed spores.