The invention relates to a fault node positioning method and device. The method comprises the steps of receiving RPC information sent by a test client through utilization of a network message server, wherein the RPC information comprises a behavior tree identifier associated with a to-be-operated behavior tree and an operation mode associated with the to-be-operated behavior tree; sending the RPC information to a behavior tree operation server through unitization of the network message server and obtaining the to-be-operated behavior tree through the behavior tree operation server according to the behavior identifier; loading the to-be-operated behavior tree to an NPC scene through utilization of the behavior tree operation server, operating the to-be-operated behavior tree according to the operation mode, thereby obtaining an operation result associated with the to-be-operated behavior tree; and receiving the operation result and sending the operation result to the test client through utilization of the network message server, thereby enabling the test client to carry out difference drawing on the operation result and positioning a fault point according to the drawn operation result. According to the method, the time cost can be reduced.