The invention relates to a method for achieving medium-voltage communication by using an arrester. A first arrester unit and a second arrester unit are respectively configured at two ends of a 10kV line; a first coupler, a first remote power line broadband communication device and a first computer terminal connected in sequence are also arranged at one end of the 10kV line; the first coupler is connected with the first arrester unit; a second coupler, a second remote power line broadband communication device and a second computer terminal connected in sequence are also arranged at the other end of the 10kV line; and the second coupler is connected with the second arrester unit. According to the method for achieving medium-voltage communication by using the arrester provided by the invention, a new 10kV line communication link is provided, and the problem that in the prior art the establishment of the communication link needs other devices besides the power line is solved.