The invention relates to an engine accessory, in particular to a connecting rod structure for engines. The connecting rod structure mainly comprises a connecting rod body and a connecting rod cover. The connecting rod structure is characterized in that: both the left and the right sides of the connecting rod cover are provided with two upper bolt holes, both the left and the right sides of a big connecting rod end are provided with two lower bolt holes, connecting rod bolts are correspondingly screwed in the upper bolt holes and the lower bolt holes on the same side, an upper positioning pin hole is arranged between the corresponding upper bolt holes, and a lower positioning pin hole is arranged between the corresponding lower bolt holes. Since the connecting rod body is provided with the screw holes, connecting rod bolts can be used for directly locking the connecting rod body and the connecting rod cover, so that connecting rod nuts are dispensed with, the connecting rod structure can be improved from the conventional flat-cut model, the connecting rod can be uniformly stressed, the strength of the connecting rod is higher than the strength of the connecting rod with two bolts by calculation and analysis, the development cycle is short, and machining is easy.