The invention discloses an obtaining method and an apparatus of information acquired by a wireless sensor, and belongs to the technical field of communication. The method includes: a central node sends a first indication to each sensor node in sequence; the first indication is used for indicating the sensor nodes to report acquired information after the reception of the first indication; each sensor node is positioned in at least one branch circuit accessed to the central node, each branch circuit comprises at least one sensor node, and the sensor nodes in each branch circuit are distributed in a tree manner; the acquired information sent by each sensor node is received, a second indication is sent to each sensor node, and the second indication is used for indicating the sensor nodes to perform hibernation with a designated duration after the reception of the second indication. The apparatus comprise a sending module and a reception module.