The invention provides a system and method for measuring multi-point radio interference on a power transmission line, and belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation projects. The system comprises a plurality of radio receiving antennas, an EMI receiver, a controller and controllable switch arrays; the radio receiving antennas are connected with the EMI receiver and the controller through the controllable switch arrays; the EMI receiver adjusts the measuring frequency, and the controller controls the on or off of a switch of one channel in each controllable switch array when a radio measurement frequency is interfered by external signals, controls the state switching of multiple switches in the controllable switch arrays, andmeasures the radio interference levels at multiple position points on the power transmission line. The system for measuring the multi-point radio interference on the power transmission line provided by the invention realizes the multi-point synchronous measurement of the radio frequency of the power transmission line, solves the problem that a traditional measurement method can only be used for single point measurement or a plurality of receivers are required, and at the same time, reduces the system cost and improves the control efficiency.