The invention discloses a short-wavelength online isolator waterproof shell. The short-wavelength online isolator waterproof shell comprises a lower shell and an upper shell, wherein the bottom of theinner wall of the lowder shell is fixedly connected with a moisture-proof board; the top of the moisture-proof board is fixedly connected with an isolator body; clamping bases which are positioned onthe left side and right side of the isolator are fixedly connected to the top of the moisture-proof board; one side of each clamping base is provided with a through hole; the through holes are communicated with the inner walls of the clamping bases; draining holes are formed in the interior of the lower shell; the through holes are communicated with the draining holes; the bottom of the shell isfixedly connected with a draining bottom board; the draining bottom board is communicated with the draining holes; one side of the inner wall of the lower shell is fixedly connected with a clamping block. By adopting the short-wavelength online isolator waterproof shell provided by the invention, the problem of influence on the production process due to the damage of the isolator since two shellsare directly stuck most of the time, water or dust enters the isolator from the joint even though the stability of the isolator is ensured when the conventional online isolator is mounted is solved.