The invention provides an interlocking apparatus of a gas insulated metal-enclosed switchgear and a gas insulated metal-enclosed switchgear. The interlocking apparatus comprises a cross beam, an adjusting block arranged in the cross beam, a locking rod plugged with the adjusting block, a delocking rod, and an adjusting device abutted against the adjusting block. The delocking rod arranged at the adjacent side of the locking rod is plugged with the adjusting block. A first elastic element sleeves the locking rod. The adjusting device consists of a drive plate abutted against the adjusting block and a microswitch base connected with the drive plate elastically; the drive plate includes a stepped plate abutted against the adjusting block and a connecting plate in sliding connection with the microswitch base. According to the interlocking apparatus, the microswitch base and the stepped plate are connected, the location of the adjusting block is adjusted by the stepped plate, and the adjusting block can return to the original position based on springback of the first elastic element. The adjusting block is driven by the delocking rod to move up and down; and the movement of the locking rod is limited to drive limiting of movement of the delocking rod, so that interlocking is realized and the cost is lowered.