The invention discloses an energy-saving oil pumping mechanism used for oil field, which belongs to the technical field of oil exploitation machinery and includes a derrick, a machine platform, a first head block assembly and a second head block assembly, a first transition block assembly, and a second transition block assembly, a power device, and a hauling cable. The machine platform is provided with a first hauling cable hole and a second hauling cable hole on a platform surface and is provided with barriers on the surrounding of the platform surface; and the machine platform is fixed on the top of the derrick. The first head block assembly and the second head block assembly are fixed on the machine platform; the first transition block assembly and the second transition block assembly are arranged on the machine platform; the power device consists of a tractor, a traction sheave and a brake, and is arranged on the machine platform; one end of the hauling cable is connected with a sucker rod and the other end is twisted on the second head block assembly, the first transition block assembly, the traction sheave, the second transition block assembly and the first head block assembly, and then is induced into the first hauling cable hole and is connected with the sucker rod of another oil well pipe or is connected with a counterweight device. The energy-saving oil pumping mechanism used for oil field has a high transmission efficiency, is convenient, safe and convenient to be used, has a simple integral structure, is convenient to be managed and protected, can realize to configure two wells for one machine, has high mechatronics degree and saves power energy.