The invention provides a method and system enabling an upper computer to realize automatic sleep and wakeup control on nodes. The objective of the invention is to solve the problem of excessively high power consumption of nodes in current building construction wireless monitoring. According to the method and system of the invention, based on the judgment on the integrity and correctness of data, each node is made to enter a sleep state under the premise that the their respective functions of the nodes are completed, and is made to maintain a wakeup state under the condition that errors exist in the data, and therefore, the nodes can automatically sleep and wake up under the control of the upper computer, and the integrity and correctness of the data can be ensured, and the power consumption of the nodes is greatly decreased. The method and system are especially suitable for long-time building construction wireless low-frequency monitoring work.