The invention discloses a coupling motion and force measuring simulation experiment system of marine floating structure under the action of internal solitary wave, which comprises a floating structuremodel, a motion response recording unit, an anchor chain unit and an anchor chain force measuring unit; the dynamic response of the floating structure model and the stress of anchor chain under the action of the internal solitary wave can be recorded in real-time; the floating structure model comprises a platform body, a motion measuring device installation department and counterweight; the floating structure model has the advantages that each part is independent, convenient to install, and convenient to increase and decrease the counterweight; with the combination of a micro-electronic gyroscope and a micro-electronic accelerometer, the motion response recording unit has the advantages of high measuring precision, small volume and low cost; the motion response recording unit not only canaccurately measure the motion response of the floating structure, but also can obtain the resultant force by analyzing the acceleration of the platform; in addition, by using fiber Bragg grating to measure the force of the anchor chain, not only can the distribution characteristics of the force of the anchor chain be obtained, but also the bending of the anchor chain can be understood through thedifferent stress and strain of the fiber Bragg grating. The construction and implementation of this experimental system is of great significance to the study of the stability of the floating structure.