An oil hydraulic press comprising a support frame, at least one main cylinder assembly and at least two fixed die tables, the at least one main cylinder assembly comprising a cylinder body and two pistons which are respectively disposed on two ends of the cylinder body and mutually coaxial and move in opposite directions, the support frame comprising two sets of end frames, the cylinder body being located between the two sets of end frames, each of the two sets of end frames, the cylinder body and each of the at least two fixed die tables forming a closed structure, such that two closed structures are formed on both sides of the cylinder body, a pressing mechanism being formed between each of the two pistons and each of the at least two fixed die tables, each of the two sets of end frames comprising two first buckle frames, wherein the two first buckle frames are symmetrically arranged around moving shafts of the two pistons, one end of each of the two first buckle frames carrying the cylinder body, characterized in that, the other end of each of the two first buckle frames carries uniting one of the at least two fixed die tables, and each of the two first buckle frames comprises a main segment and a bending segment, the main segment and the bending segment are curved or curve-like, and the curvature of the main segment is smaller than that of the bending segment, one end of the main segment is connected with the cylinder body, and the other end of the main segment is connected with one end of the bending segment, the bending segments of the two first buckle frames are interconnected and form a connection surface at the joint, the one end of the main segment connected to the cylinder body is provided with a groove, and the corresponding cylinder body is provided with a protrusion that cooperates with the groove, ends of the two first buckle frames forming the connection surface are provided with pin holes, which are coupled to pins. the at least one main cylinder assembly comprising a cylinder body and two pistons which are respectively disposed on two ends of the cylinder body and mutually coaxial and move in opposite directions, the support frame comprising two sets of end frames, the cylinder body being located between the two sets of end frames, each of the two sets of end frames, the cylinder body and each of the at least two fixed die tables forming a closed structure, such that two closed structures are formed on both sides of the cylinder body, a pressing mechanism being formed between each of the two pistons and each of the at least two fixed die tables, each of the two sets of end frames comprising two first buckle frames, wherein the two first buckle frames are symmetrically arranged around moving shafts of the two pistons, one end of each of the two first buckle frames carrying the cylinder body, characterized in that, the other end of each of the two first buckle frames carries uniting one of the at least two fixed die tables, and each of the two first buckle frames comprises a main segment and a bending segment, the main segment and the bending segment are curved or curve-like, and the curvature of the main segment is smaller than that of the bending segment, one end of the main segment is connected with the cylinder body, and the other end of the main segment is connected with one end of the bending segment, the bending segments of the two first buckle frames are interconnected and form a connection surface at the joint, the one end of the main segment connected to the cylinder body is provided with a groove, and the corresponding cylinder body is provided with a protrusion that cooperates with the groove, ends of the two first buckle frames forming the connection surface are provided with pin holes, which are coupled to pins.