The invention relates to an oil film rigidity-adjustable fluid dynamic and static pressure slide bearing. The bearing comprises a front static pressure oil cavity, an upper static pressure oil cavity, a lower static pressure oil cavity, a dynamic pressure cavity, three oil inlet holes, three axial oil return grooves and an oil supply system; the three oil inlet holes are respectively communicated with the front static pressure oil cavity, the upper static pressure oil cavity and the lower static pressure oil cavity, and are connected with the oil supply system; a wedged cavity is formed between the upper static pressure oil cavity and the dynamic pressure cavity; and the section of the wedged cavity is an Archimedes spiral oil cavity molded surface. The bearing overcomes and makes up the defects of other dynamic and static pressure slide bearings, preferably solves the wear problem caused by friction contact with the dynamic and static pressure bearing during starting of a main shaft, has the prominent characteristic of adjustability of oil film rigidity, and facilitates guarantee of revolving precision of a main shaft system and prolonging of service life.