Contact angle measuring machine

A contact angle measuring machine includes a machine body, a liquid injection device, a detection platform, a vacuum suction device, a light source device, and a camera device. The liquid injection is disposed on the machine body and movable along the Z-axis direction. The detection platform is disposed on the machine body and movable along the X-axis and the Y-axis direction, so that the liquid injection device drops the liquid drop toward the carrier plate on the detection platform. The vacuum suction device is disposed on the machine body and provides vacuum suction for sucking the carrier plate. The light source device and the camera device are disposed on opposite sides of the machine body. The camera device captures the image of the liquid drop dropping on the carrier plate, and calculates and displays the contact angle of the carrier plate through a display device.