The invention relates to a full-automatic contact type measuring device and method. The measuring device comprises a test bench, a longitudinal sliding table and a cross beam, wherein the longitudinalsliding table is longitudinally arranged on the test bench in a sliding mode and can be used for fixedly placing a measured workpiece, the cross beam is suspended above the test bench, and a measuring arm which can move back and forth along the cross beam is arranged on the cross beam. Compared with the prior art, the device in the invention is the device specially for rapid and high-precision measurement of the geometric dimension of large-size workpieces with pores and burrs on the surface, a contact type displacement sensor is used for measuring the size of the workpiece, and the defects of the existing measuring method are avoided, so that the influence of the pores and burrs on the surface of the workpiece on the precision can be avoided by the measuring device, the measurement of the large-size workpiece is more efficient and accurate, relatively complex workpiece shapes can be adapted to, and various dimensions of the thickness, the perpendicularity, the parallelism, the flatness and the like can be measured; meanwhile, the cost of the measuring device is lower, and the maintenance and the calibration are simpler and more convenient.