Planeness detection and correction all-in-one machine and detection and correction method

The invention relates to a planeness detection and correction all-in-one machine which comprises a machine cabinet assembly, a fixture assembly for clamping a workpiece to be detected and corrected and a control assembly for controlling the detection and correction. The all-in-one machine further comprises a detection assembly and a correction assembly, wherein the detection assembly comprises a portal frame assembly achieving moving on an X axis, a Y axis and a Z axis and a laser displacement sensor, and the correction assembly comprises a correction mechanism and a contact type digital sensor. The detection assembly and the correction assembly are connected with the control assembly to carry out information interaction to achieve the detection and the correction of the planeness. The planeness detection and correction all-in-one machine can detect whether products are qualified or not, can also carry out correction on sub-quality products, and the effects of improving production efficiency, detection precision and the product percent of pass and reducing cost are achieved.