An acquisition method for data in a wireless body area network, comprising: a central device acquiring topology structure information of a network formed by node devices, and according to the topology structure information of the network, determining time slot information about a super-frame that corresponds to the topology structure information of the network and allocating the node device to a time slot of a first Managed Access Phase called MAP1; Broadcasting the allocated time slots of the MAP1 phase; the central device acquiring packet loss information of each node device in the MAP1 phase, and allocating time slots of a second Managed Access Phase called MAP2 to all the node devices in which packets were lost in the MAP1 phase according to the packet loss information; after broadcasting the allocated time slots of the MAP2 phase, the central device acquiring service data packets in the MAP2 phase; characterized in that, after broadcasting the time slot information of the MAP1 phase, the central device acquiring service data packets of an Exclusive Access Phase called EAP, a Random Access Phase called RAP and the MAP1 phase in sequence; and in that the steps of a central device acquiring topology structure information of a network formed by node devices, and according to the topology structure information of the network, determining time slot information about a super-frame that corresponds to the topology structure information of the network comprise: acquiring types of the node devices, data type acquired by the node devices and the acquisition frequency; determining the time slot information of the super-frame according to the types of the node devices, the data type acquired by the node device and the acquisition frequency. a central device acquiring topology structure information of a network formed by node devices, and according to the topology structure information of the network, determining time slot information about a super-frame that corresponds to the topology structure information of the network and allocating the node device to a time slot of a first Managed Access Phase called MAP1; Broadcasting the allocated time slots of the MAP1 phase; the central device acquiring packet loss information of each node device in the MAP1 phase, and allocating time slots of a second Managed Access Phase called MAP2 to all the node devices in which packets were lost in the MAP1 phase according to the packet loss information; after broadcasting the allocated time slots of the MAP2 phase, the central device acquiring service data packets in the MAP2 phase; characterized in that, after broadcasting the time slot information of the MAP1 phase, the central device acquiring service data packets of an Exclusive Access Phase called EAP, a Random Access Phase called RAP and the MAP1 phase in sequence; and in that the steps of a central device acquiring topology structure information of a network formed by node devices, and according to the topology structure information of the network, determining time slot information about a super-frame that corresponds to the topology structure information of the network comprise: acquiring types of the node devices, data type acquired by the node devices and the acquisition frequency; determining the time slot information of the super-frame according to the types of the node devices, the data type acquired by the node device and the acquisition frequency. acquiring types of the node devices, data type acquired by the node devices and the acquisition frequency; determining the time slot information of the super-frame according to the types of the node devices, the data type acquired by the node device and the acquisition frequency.