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Aiming at the problem that the aerostat platform is limited by its own processor performance in the process of data transmission, a data transmission scheme of aerostat platform based on lightweight AES algorithm is proposed. Firstly, based on the AES encryption algorithm, the scheme realizes the lightweight AES encryption algorithm by finding the local optimal times of the loop function and changing the row shift transform of the state matrix to the column shift transform. Secondly, through byte substitution, column shift transformation, column mixing and round key addition four steps, the lightweight AES encryption algorithm based on seven round function cycle is designed. Finally, the flight data of different types of aerostat platform were preprocessed by byte filling and matrix rotation, the pre-processed data is used as the data source to test and analyze the transmission scheme, which verifies the security and effectiveness of the lightweight AES encryption algorithm. Experimental results show that compared with AES encryption algorithm, the proposed algorithm can not only ensure the safe transmission of data, but also improve the running speed of the algorithm, and can be applied to the aerostat platform better.