The invention discloses a novel prefabricated structure precast column unit which comprises an embedded nut arranged in a precast column. The distance between the embedded nut and the top of the precast column is 120mm, the spacing of two sides of a center line of a beam is D/4 (D refers to the width of a supporting bracket), the supporting bracket mainly comprises angle steel, a positioning steelplate, a reinforcing steel plate, a high-strength bolt and a nut, during industrial production, circular holes are formed in the side face of the angle steel, the depth of each circular hole is 5mm,the diameter of each circular hole is 100mm, the positioning steel plate is arranged at the top of the angle steel, the reinforcing steel plate is arranged on the side face of the angle steel, and a composite beam is fixed. The novel prefabricated structure precast column unit has the advantages that erection of a vertical support at the end of the junction of the precast column and the compositebeam is omitted, on-site construction is simple and convenient, a site is less in loading, the precast column, the composite beam and the supporting bracket can be produced in a standardized manner ina factory, economic feasibility is strong, the supporting bracket can be recycled, a green building conforms to national advocacy, the supporting bracket is arranged at the junction of the precast column and the composite beam, mortar leakage in casting can be avoided, and construction quality is ensured.