The invention discloses a stress observation device for an ocean structure under an internal solitary wave environment and belongs to the technical field of electromechanical integration. The stress observation device comprises a box, wherein a connecting plate is arranged at the bottom of the box; a fixing column is arranged at the bottom of the connecting plate; the fixing column is fixed under an ocean internal solitary wave environment; a pressure sensor and a vibration sensor in the fixing column are used for monitoring the stress data of the fixing column when the internal solitary wave is generated in the ocean; a central processing unit and a simulation computer are interacted with each other, so that the practical stress condition of the fixing column under the ocean internal solitary wave environment is simulated and calculated; a wireless data storage hard disk is used for storing the monitored pressure data and the simulated stress data; the researcher is convenient to observe, account and record the stress condition of the fixing column under the ocean internal solitary wave environment in the later period; and the stress observation device is beneficial to the stabilization of the building constructed under the ocean internal solitary wave environment.