The invention relates to a 0.4 kV switch grounding device. The 0.4 kV switch grounding device comprises a first wiring terminal, a second wiring terminal and a third wiring terminal, wherein the firstwiring terminal is connected with the second wiring terminal, and the third wiring terminal is arranged between the first wiring terminal and the second wiring terminal and is connected with the first wiring terminal and the second wiring terminal; the first wiring terminal comprises a first copper piece handle, a hollow square-shaped copper component, a wiring bolt and a first operating rod, wherein the first copper piece handle is connected with the hollow-square-shaped copper component, and the wiring bolt passes through the concentric-square-shaped copper member and is connected with a first operating rod. According to the 0.4 kV switch grounding device provided by the invention, through the arrangement of the first wiring terminal, the second wiring terminal and the third wiring terminal, the telescopic connection of the grounding device is realized, the operation space is increased, an operator is prevented from touching other electrified pieces by mistake, and the potential safety hazard is eliminated.