Abstract: Disclosed is a continuous electrical variable measuring apparatus for a power distribution cabinet, falling within the technical field of electrical variables of power distribution cabinets. By arranging an arc-shaped cover plate, an electrical variable measuring apparatus body can be completely wrapped together with a protective box, avoiding accidental damage caused by collision with other goods during transportation or storage, thus playing a good protective effect. Moreover, when the apparatus is used, the arc-shaped cover plate can be slid to expose the electrical variable measuring apparatus body, facilitating a worker to perform test operation. The arc-shaped cover plate does not require to be disassembled during use, and the arc-shaped cover plate is still integrated with the protective box, avoiding a situation that the arc-shaped cover plate needs to be separately stored during electrical variable test, thus making the detection process faster and more convenient.