The invention discloses a hydraulic oil cylinder capable of reducing pressure loss and burn and belongs to the technical field of hydraulic pressure. The hydraulic oil cylinder comprises a cylinder head, a flange, a piston and a cylinder barrel. The flange or the cylinder barrel is provided with an oil through opening. An annular groove structure is formed between the connecting end of the cylinder head and the inner wall of the cylinder barrel. The oil through opening communicates with an annular groove which communicates with the interior of the cylinder barrel. By adoption of the hydraulic oil cylinder, the oil through process has no inflection point or diameter change, the pressure loss caused in the oil liquid transferring process is greatly reduced, the impact noise of oil liquid at the position of a pipeline in the oil liquid transferring process is greatly lowered, and meanwhile, the diesel burn effect is avoided.