Electromagnetic closed shell

A shell cover covers a shell, the shell is fixed on a high-potential board card, and a closed cavity is formed by the shell cover, the shell and the high-potential board card; the clamping groove is located on the outer side of the shell, and the buckle is located on the shell cover. And the buckle is buckled on the clamping groove, so that the shell cover and the shell are connected in a sealing manner. According to the high-potential board card provided by the utility model, the shell and the shell cover form a closed space, so that mutual interference among electronic components can be prevented; the anti-electromagnetic interference and anti-pollution capability of the high-potential board card is effectively improved, and the operation reliability of the high-potential board card is improved. And the buckles are buckled on the clamping grooves, so that the shell cover and the shell are connected in a sealed manner, the shell cover and the shell are also convenient to disassemble, and the use is convenien