The invention provides a cocoon heating and drying device provided with pretreatment. The device comprises a box body; a moisture discharge hole is formed in the top of the box body; multiple cavities are formed in the box body from bottom to top, and are at least provided with a heating chamber, a drying chamber and an insulation chamber; the heating chamber is above the drying chamber; the insulation chamber is below the drying chamber; a heater is arranged in the heating chamber; a hot air circulating device is arranged on the side wall of the drying chamber; an insulation lamp is arranged on the inner wall of the insulation chamber; a water receiving device is arranged in the drying chamber; a baseplate of the heating chamber is a filter screen plate; one end of the baseplate is rotationally arranged on the box body, and a gap is formed between the other end of the baseplate and the inner wall of the box body; a swing mechanism is arranged at the lower end of the baseplate for controlling rotation; the heating chamber, the drying chamber and the insulation chamber are all provided with temperature sensors; and the temperature sensors are connected to a first cylinder control device. The device is uniform in drying and controllable in temperature and humidity, meanwhile, greatly improves the drying efficiency, and is high in automation degree.