Data transmission method, node and system in wireless sensor network

The invention discloses a data transmission method, a node and a system in a wireless sensor network. The method comprises the following steps that: a source node creates a channel according to a routing table when determining to transmit data to a destination node, wherein the routing table comprises a neighboring node identifier, link quality from the neighboring node to a current node, rest energy of the neighboring node and hop count of the neighboring node, and the channel comprises a main path node and a channel node; the source node divides the initial data to be transmitted into specified amount of data packets, and performs network coding on the specified amount of data packets; and the source node transmits the coded data packets through the channel. With the data transmission method, the node and the system in the wireless sensor network, the problem of higher energy consumption for data transmission in the wireless sensor network is solved, and the reliability of transmission is also ensured.