Embodiments of the present invention disclose a coating method, comprising determining a coating state of a current substrate being an uncoated state in which none of a predetermined coating is coated thereon, a coating underway state in which a part of the predetermined coating is coated thereon or a coating completion state in which all of the predetermined coating is coated thereon, when a coating suspension is detected during coating the current substrate; in a case that the current substrate is in the uncoated state, further coating the current substrate or starting coating a next substrate; and in a case that the current substrate is in the coating underway state or the coating completion state, starting coating a next substrate.