The invention belongs to the field of nuclear power station instrument error verification and specifically relates to a steam turbine differential expansion and shaft displacement instrument portable verifying table for improving verification accuracy and reliability of steam turbine differential expansion and shaft displacement instruments. The steam turbine differential expansion and shaft displacement instrument portable verifying table comprises a magnetic pedestal, three locking switches, a guide rail, a dial indicator fixing arm, a translation table, a translation knob, a displacement table and rotating table connecting frame, a rotating table locking screw nut, a rotating table, a rotating table fixing frame, a displacement table, a displacement locking screw nut, a spiral micrometer knob, an instrument fixing module connecting support, a differential expansion instrument fixing module, a shaft displacement instrument fixing module, a dial indicator, a differential expansion instrument, a prepositioned device, a cam, and a shaft displacement instrument. The steam turbine differential expansion and shaft displacement instrument portable verifying table has beneficial effects of quickly and accurately adjusting a gap between the instrument and a steam turbine large shaft with error precision less than 0.1 mm; precisely controlling the moving stroke of the instrument and quickly completing total stroke; and achieving online verification of at least three shaft displacement so as to greatly improve work efficiency.