The invention discloses a large-batch steel paint spraying integrated machine. The large-batch steel paint spraying integrated machine comprises a base. The base is provided with a paint spraying mechanism and an adjusting mechanism. The paint spraying mechanism is jointly composed of a support, two sets of rectangular through holes, a set of racks, rectangular covers, limiting switches, a paint sprayer, through holes A, two sets of synchronous rotation motors, gears and signal receivers. The support is fixedly arranged on the upper surface of the exterior of the base, the two sets of rectangular through holes are formed in the surfaces of the opposite sides of the support, the set of racks are inserted in the two sets of rectangular through holes, and the rectangular covers are fixedly arranged on the racks. The limiting switches are arranged at the two ends of each rack in the set of racks. The paint sprayer is arranged on a support of the set of racks. The through holes A are formed in the surfaces of the opposite sides of the paint sprayer. The two sets of synchronous rotation motors are arranged in the paint sprayer, and the rotation ends of the two sets of synchronous rotation motors penetrate the through holes A and extend out of the paint sprayer. The gears are fixedly arranged at the rotation ends of the two sets of synchronous rotation motors. The signal receivers are arranged in the two sets of synchronous rotation motors. A controller is arranged on one side of the base and electrically connected with the paint spraying mechanism and the adjusting mechanism. The large-batch steel paint spraying integrated machine has the beneficial effects of being simple in structure and high in practicability.