The invention relates to an isolation device for a low-voltage switch. The isolation device includes a shielding part and a fixing part connected with the shielding part. The shielding part includes apanel and side plates arranged on both sides of the panel. The fixing part is connected with the panel. The fixing part is a spring clip. Two clamping heads of the spring clip are provided with fixing posts. The live low-voltage switch is isolated through the isolation device. When the staff is working on the ground wire of the low-voltage switch during outage, the staff is prevented from accidentally touching the live low-voltage switch. Electric shock injuries are avoided. The operation safety is improved.