The invention discloses a machining process for connecting rod weldments. The machining process includes: step 1: a laser cutting machine is used for cutting a material, so that the shape of a product is preliminarily cut out; step 2: a milling machine is used for further finishing the cut product; step 3: the four corners of the material are chamfered; step 4: the junctions are rounded after chamfering is completed; step 5: a column which is 26mm in diameter phi and 30mm in length is welded at a position 90mm away from one end of the product; step 6: the surface of the machined product is polished until the surface roughness of the product is Ra3.2; step 7: the finished product is subjected to stress treatment; step 8: the product is inspected and warehoused. By shape cutting on the laser cutting machine, finish-milling on the milling machine, chamfering, rounding, welding, surface polishing and stress treatment, the machining process for connecting rod weldments meets production requirements, the precision and strength of the produced connecting rod weldment are improved and accord with requirements, the defective rate is reduced, the production cost is reduced.