The invention discloses a real time monitoring method for resin rheological property under an action of ultrasound, and an apparatus thereof. The monitoring method is characterized by: directly putting a detection sensor in a resin container under the action of the ultrasound; carrying out dynamic, real-time, multi-point and exact measuring and monitoring for resin viscosity and the resin rheological property when the resin is under the action of the supersonic vibration. The apparatus comprises a viscosity tester, a temperature controller, a bathtub, a temperature tester and the resin container. The apparatus is characterized in that: the apparatus further comprises an ultrasonic transducer, a ultrasonic generator, a fixing apparatus and a isolation apparatus, wherein the ultrasonic transducer is arranged in the isolation apparatus through the fixing apparatus, a tool rod of the ultrasonic transducer sequentially passes through the isolation apparatus and a side wall of the resin container, and enters into the resin container, and is provided for directly acting on the resin requiring detection. The tool rod can be freely adjusted in three dimensions, wherein the tool rod can swing up and down, left and right, and stretch forward and backward in the resin container, such that real time measuring and monitoring of the resin rheological property at different space position points on the face under the action of the ultrasound are realized.