Pressure automatic compensator for under water sensor

A pressure automatic compensator for underwater sensors belongs to a component of underwater sensors, and is applied to the force measuring and weighing technical field. An elastic body assembly 1 is arranged in a jacket assembly 3, and welded with the jacket assembly 3. An upper diaphragm 2 is respectively welded with the elastic body assembly 1 and the jacket assembly. A transmission rod 4 is in thread connection with the elastic body assembly 1. A lower diaphragm 6 is respectively welded with the transmission rod 4 and the jacket assembly 3. A bottom seat 5 is fixedly connected with the jacket assembly. The upper diaphragm 2 has the same area with the lower diaphragm 6. The utility model has the advantages that the pressure of sensors can be automatically compensated in water, the measurement precision of the sensors is improved and the product of the class can be applied to the occasions of higher requirements.