The invention discloses an engine connecting rod bolt assembly structure. The engine connecting rod bolt assembly structure comprises a connecting rod body; one end of the connecting rod body is a small end, and the other end is a large end; the large end is surrounded by end parts of a connecting rod cover and the connecting rod body; a bearing is arranged in the large end; the connecting rod cover and the connecting rod body are connected through four bolts; a concave part is arranged at one end of the connecting rod cover; a convex part is arranged at the other end of the connecting rod cover; a recess part and a projection part corresponding to the concave part and the convex part are arranged at the end parts of the connecting rod body; and the concave part, the convex part, the recess part and the projection part are all cross. The invention aims to provide the engine connecting rod bolt assembly structure with stable and reliable operation.