The invention discloses a formwork hydraulic bracket for pouring a gob-side pier column in gob-side entry retaining and a using method thereof. The formwork hydraulic bracket comprises a detachable cylinder formwork, telescopic mechanical arms and step taking self-moving brackets with every two rows as one set; the detachable cylinder formwork is formed by hinging of one ends of two formwork bodies with the cross sections being in semi-circle shapes; the other ends of the two formwork bodies are freely opened and closed, and when the other ends of the two formwork bodies are closed, the detachable cylinder formwork is formed; the telescopic mechanical arms are connected with the cylinder formwork and the self-moving brackets; the self-moving brackets are formed by connecting of two rows of narrow bracket bodies through transverse oil cylinders; each row of narrow bracket bodies is divided into front and back bracket units; and the front and back bracket units in the same row are connected through longitudinal oil cylinders. The concrete pier column is poured through the detachable cylinder formwork, the telescopic mechanical arms control the cylinder formwork to extend, retract and be closed and opened, and the self-moving brackets serve as travelling main bodies and realize step taking and moving frontward and top plate support of the formwork hydraulic bracket. The formwork hydraulic bracket is widely used in the fields such as coal mine gob-side entry retaining, roadway support and underground engineering.