The invention discloses a through type hydraulic swing oil cylinder. The through type hydraulic swing oil cylinder comprises a cylinder body stator, a cylinder body rotor, an end surface sealing part, rotor blades and stator blades, wherein the cylinder body stator adopts a hollow structure, first support parts are fixed on the inner wall of the cylinder body stator, a first support groove is formed between each pair of first support parts, and the stator blades are clamped in the first support grooves; oil delivery holes are formed in the cylinder body stator; the cylinder body rotator adopts a cylindrical structure, second support parts are fixed on the peripheral surface of the cylindrical structure, a second support groove is formed between each pair of second support parts, and the rotor blades are clamped in the second support grooves; during mounting, the cylinder body rotor penetrates through the hollow structure, the end surface sealing part is pressed on end surfaces of the stator blades, and a closed space is formed among outer walls of the end surface sealing part, the stator blades and the cylinder body rotor and communicated with the oil delivery holes.