The invention provides an electric wrench rack with a water discharging groove and applicable to hot-line work and relates to an electric wrench sleeve assembling and disassembling device. An electric wrench needs to be matched with bolts with different diameters so that a sleeve needs to be frequently replaced; and the sleeve commonly can be disassembled by two people so that the potential safety hazard is great and the efficiency is low. The electric wrench rack comprises a sleeve assembling and disassembling device, a wrench placing rack and a fixed rack, wherein the sleeve assembling and disassembling device comprises a disassembling plate, a sleeve box and a rear plate; the disassembling plate is provided with a plurality of U-shaped clamping grooves; openings of the clamping grooves are chamfered or rounded; the sleeve box is provided with a plurality of sleeve containing cavities; the clamping grooves are communicated with the sleeve containing cavities; a notch is arranged between the disassembling plate and the sleeve box; the fixed rack is provided with an n-shaped slot; a positioning column is arranged on the inner wall of the slot; the positioning column is provided with a screw hole for penetrating a bolt which is abutted against a bucket arm curb frame; a counter bore is formed on the rear face of the fixed rack; an insulating layer covers the surface of the fixed rack; and a water discharging groove is opened on a bottom plate of the sleeve box. According to the technical scheme disclosed by the invention, the assembling and disassembling efficiency of a sleeve is high; and the electric wrench rack is reliable, is good in working safety and is good in insulation.