Capacitive double measuring bar butt joint flatness detector

The invention relates to a capacitive double measuring bar butt joint flatness detector, comprising a case and an upper cover arranged at the top of the case; wherein the case is internally symmetrically provided with a left measuring bar and a right measuring bar the heads of which stretch out the base plate of the case, the heads of the left and right measuring bars are respectively provided with a measuring head, the outer sides of the left and right measuring bars in the case are respectively provided with a guide rail fixed on the inner wall of the case, the inner sides of the left and right measuring bars are provided with a capacitance pole plate fixed on an insulation block, the two sides of the insulation block are respectively fixed on the left and right measuring bars, the leftand right measuring bars are respectively provided with a slide block moving along with the guide rail, the bottom of the slide block is provided with a spring, the upper end of the case is fixed with a positioning plate whic