Abstract: Disclosed are an Internet of Things data transmission data and system. The method comprises a downlink transmission step: obtaining first downlink data delivered by an Internet of Things platform; parsing the first downlink data to obtain a target meter of a metering task and a forwarding priority in a first packet; obtaining second downlink data; adding the second downlink data to an asynchronous delivery queue according to the forwarding priority; and delivering the second downlink data to the target meter according to the asynchronous delivery queue, so that the target meter completes the metering task. The present method makes full use of concentrators as intermediate devices while maintaining the integrity of core task data, lowers the channel requirement due to asynchronous execution and is especially suitable for periodic metering tasks.