The utility model provides an insulation connecting structure between electromagnetic wave measurement while drilling downhole instruments and belongs to the technical field of manufacture of the electromagnetic wave measurement while drilling downhole instruments of the oil exploration field. The outer surface and external threads of a connecting joint are provided with a solidifiable fluid ceramic layer; a thermal spraying ceramic layer which is arranged outside the solidifiable fluid ceramic layer wraps an outer abrasion-resistant ceramic ring; one end of the connecting joint is connected with the outer abrasion-resistant ceramic ring; the other end of the connecting joint is connected with a transition joint; the solidifiable fluid ceramic layer is arranged between the connecting joint and the transition joint; conducting cables which penetrate the connecting joint are connected with one ends of sealing contact needles; solidifiable fluid ceramic wraps the sealing contact pins; a sealing joint is connected with one end of the connecting joint; the sealing joint is connected with the other ends of the sealing contact pins. According to the insulation connecting structure between the electromagnetic wave measurement while drilling downhole instruments, electrode conducting cables and signal cables can be arranged inside the insulation connecting structure and the safety of two end instrument circuits which are connected with the insulation connecting structure can be protected due to the sealing design which is formed at two ends of the insulation connecting structure after the insulating connection fails.