The invention discloses a sensor network test bed system and a test method thereof. The sensor network test bed system comprises a network to be tested and a monitoring platform, wherein the network to be tested comprises a plurality of mutually-heterogeneous nodes. The test method comprises the following steps that: step 1, a user sets the ID (Identities) of the nodes of the network to be tested, operating node programs of the nodes, the operation start time of the nodes and the operation end time of the test bed system according to the operation scheme of the test bed; step 2, the monitoring platform downloads the corresponding node programs to the nodes according to the ID of the nodes through a monitoring information channel; step 3, the nodes automatically operate the node programs according to the operation start time, acquire test data during the operation and transmit the acquired test data to the monitoring platform; step 4, the monitoring platform stores the received test data; and step 5, the monitoring platform notifies the nodes of the network to be tested to stop operating the node programs when the operation end time of the test bed system reaches. The invention canrealize the heterogeneous sensor network test bed.