Disclosed is an automatic sealant production line, including a sealant preparation apparatus and a packaging apparatus. The sealant preparation apparatus includes a material storage device, a liquid storage device, a material sending device, a lateral material feeding device, a first-order screw unit, a first liquid feeding device, a heat exchanger, a second-order screw unit, a pigment feeding device, a cooler and a buffer tank device. The packaging apparatus includes a filling device and a packaging device.