An integral assembled frame precast beam includes two lower part longitudinal reinforcements, two upper part longitudinal reinforcements, a plurality of rectangular stirrups for binding the four reinforcements, and a common concrete precast beam, wherein the two lower part longitudinal reinforcements and the two upper part longitudinal reinforcements are bound on four corners of the rectangular stirrups; ECC (engineered cementitious composites) precast blocks are placed at the left end and the right end of the common concrete precast beam; four upper part positioning steel angles are welded at the two ends of the two upper part longitudinal reinforcements; and four lower part positioning steel angles are welded at the two ends of the two lower part longitudinal reinforcements; the four ends of the two upper part longitudinal reinforcements all extend out of the four upper part positioning steel angles; and the four ends of the two lower part longitudinal reinforcements are all shrunk inside the four lower part positioning steel angles. The integral assembled frame precast beam provided by the invention is convenient for construction, overcomes the defect that weak positions at the joint are centralized, enhances the shear-bearing capacity, greatly lowers the possibility of misplacement during the construction, is convenient for positioning, enhances the shear-bearing capacity and the ductility of the frame beam, and improves the entire earthquake-proof performance of the structure.