Method for testing shielding effectiveness of cable shielding layer

The invention discloses a method for testing shielding effectiveness of a cable shielding layer. The method is characterized in that a testing device is placed into a shielded room, a tested device of an unshielded cable and a shielded cable are connected on the testing device, the radiated electric field of the tested device is received by an antenna, the distance between the antenna and a cable to be tested ranges from 0.8m to 1.5m, the testing frequency of a testing system is 2MHz-18GHz, a radiated electric field value received by the antenna is finally inputted to a computer through a measuring receiver, stored and processed. The method has the advantages of wide testing frequency, high efficiency, low cost, high accuracy, easiness in implementation, convenience in measurement and the like.