The invention discloses a coating spraying machine. The coating spraying machine is characterized in that a distance sensor is arranged above the head portion of a spray head, a spring is arranged below the distance sensor, and the distance sensor is connected with the spring in a welded mode; the distance sensor is connected with an intelligent controller, and the intelligent controller is connected with a power output device; a magnetic induction coil is arranged below the head portion of the spray head, and the magnetic induction coil generates magnetic force under the action of current; anarmature is welded below the spring, the armature is attracted to droop after the magnetic force is generated, and a nozzle at the top of the spray head is partially covered after the armature droops; a high-speed centrifugal blower is connected to the left end of an injection pipe, and a spray pipe is connected to the right end of the injection pipe; and a flow suction pipe is located below an atomization chamber, and the flow suction pipe is connected with a liquid storage tank. The coating spraying machine has reliable quality, convenient operation and high construction efficiency.