The invention provides a data packet transmission method and a node. The method comprises the following steps: the node transmits a new data packet at a first time slot within a period within a predetermined time period and retransmits the data packet by using the reset time slots within the period; and after the predetermined time period, the node retransmits the data packet within at least two time slots within the period. By adoption of the embodiment of the invention, the reliability of data transmission can be improved, and the network throughput can also be ensured.