The invention provides a coaxial radio frequency board-to-board connector which is characterized in that an upper buckling cup is designed for a top circuit board, a lower buckling cup is designed fora bottom circuit board, the upper buckling cup and the upper buckling cup are both of a cup body structure and serve as an upper connector and a lower connector, and an annular positioning groove isformed in the lower buckling cup. An inner conductor and outer conductor assembly is designed between the upper buckling cup and the lower buckling cup, the inner conductor and outer conductor assembly is composed of an outer conductor, an inner conductor and an insulator, the outer conductor is a tubular body, the upper end of the outer conductor is provided with an upper lug, the lower end of the outer conductor is provided with a lower lug, the inner conductor is an elastic pin, and the insulator serves as an insulation support between the inner conductor and the outer conductor. In the usestate, the lower part of the inner conductor and outer conductor assembly is in butt joint with the lower buckling cup, the lower lug is clamped in the annular positioning groove, the upper part of the inner conductor and outer conductor assembly is in butt joint with the upper buckling cup, and the upper lug is positioned in the upper buckling cup in a floating manner so that connection is realized. According to the scheme, the problems that the existing coaxial radio frequency board-to-board connector is complex in structure and high in cost are solved.