The invention relates to a wireless network technology, and specifically relates to a mixed media access control method for a chained wireless sensor network. According to the method, the characteristics of a chained or linear topological structure of a wireless sensor network applied to transmission line monitoring and the like are taken into full consideration, different access strategies are adopted in different periods of time of the network, and an approach of time division multiple access control Pipelined TDMA for busy periods and an approach of competitive media access control S-XMAC for idle periods are put forward. In busy periods, a pipelined scheduling transmission method is used to avoid hidden terminal problems in order to improve the transmission reliability and the resource utilization rate. In idle periods, different MAC parameters are adopted for a cluster head and ordinary cluster members so that the ordinary cluster members can save energy as much as possible on the premise that the cluster head and the ordinary cluster members can respond to a request in a more timely manner. Therefore, the requirement of an application system on the real-time performance of the network is met while the energy of the network is saved.