The present disclosure provides a thin-film-deposition equipment, which includes a main body, a carrier and a shielding device, wherein a portion of the shielding device and the carrier are disposed within the main body. The main body includes a reaction chamber, and two sensor areas connected to the reaction chamber, wherein the sensor areas are smaller than the reaction chamber. The shielding device includes a first-shield member, a second-shield member and a driver. The driver interconnects the first-shield member and the second-shield member, for driving the first-shield member and the second-shield member to move in opposite directions. During a deposition process, the two shield members are separate from each other into an open state, and respectively enter the two sensor areas. During a cleaning process, the driver swings the shield members toward each other into a shielding state for covering the carrier.