In order to improve the safety and reliability of the low amount of data under the environment of the IOT key, the need for low amount of data under the environment of internet key management algorithm and key management scheme was designed. Using the current management algorithm of low amount of data under the environment of internet key management, increase to a certain number of network nodes in the Internet of things next, can not guarantee the safety and reliability of low data under the environment of the Internet of things. Therefore, put forward a method of network key management algorithm and scheme design of low amount of data environment based on LHKE. The algorithm is a low amount of data the new ring is formed by the current algorithm based Qoskm algorithm Under the environment of the IOT key algorithm, the same two low amount of data will be set up in the key tree algorithm, through the calculation of multicast members in the Internet of things on trust and security, the members of multicast degree and safety high degree of trust on a low amount of data on the key tree, the other members in the multicast another low amount of data on the key tree, and then through the LHKE algorithm initialization, key generation and key generation network in three stages, the low amount of data under the environment of internet key management. The experiments show that the proposed algorithm improves the safety and reliability of the low amount of data under the environment of IOT key.