(B, ) the utility model relates to a light communication technical field is an overlength is apart from optical cable pad control on -line monitoring device, and it includes high power light source emission device, light signal receiver, data analysis processing apparatus, environmental parameter sensor, and high power light source emission device passes through the optical cable to be connected with signal receiver's input solely, and the overlength is equipped with the environmental parameter sensor apart from the optical cable on, high power light source emission device, light signal receiver, environmental parameter sensor are connected with data analysis processing apparatus through the cable respectively. The utility model has the advantages of reasonable and compact structure, convenient to use, it is made a start difference that the power sum received end power through calculation and draws the pad control data, collects and deposit in the backend server database according to the A certain amount of time interval, combines environmental data to gather assay when the data of phase weekly, and aassessment optical cable pad control is along with the situation of change of environment. (B, )