Coaxial capacitance sensor applicable to high-moisture-content measurement range

The utility model provides a coaxial capacitance sensor applicable to a high moisture content measurement range, which comprises a cylindrical inner electrode, the inner electrode is inserted into aninner insulating layer made of epoxy resin materials, four O-shaped ring grooves and external threads are arranged at the top end of the inner insulating layer, and O-shaped rings are arranged in thefour O-shaped ring grooves; an outer electrode is coaxially nested outside the inner electrode, the outer electrode is a hollow cylinder, an annular gap is formed between the outer electrode and the inner electrode, the top end of the outer electrode is provided with an internal thread, the internal thread is in threaded connection with the external thread, the lower side of the internal thread isprovided with an inner sealing surface, and the inner sealing surface is in sealing connection with the two corresponding O-shaped rings; a connecting pipe is arranged at the upper end of the outer electrode, a flange plate is