The invention relates to an all-weather solar drying device and belongs to the technical field of solar drying. The all-weather solar drying device is characterized in that water is heated by absorbing heat energy, the heated water heats fresh air through heat exchanging, the heated air is guided into a drying chamber to increase the temperature of materials, moisture contained in the materials isevaporated during high-temperature baking, the temperature and humidity of air in the heating chamber rise constantly, a dehumidifier automatically starts to discharge the high-humidity air when thetemperature and humidity of the air exceed a set value, the high-humidity air is discharged into a water tank through a moisture discharge pipe, the dehumidifier stops working after the moisture is discharged, and the process above is repeated when the set humidity and temperature is reached until drying requirements are met; in the drying process, when solar energy is insufficient and temperaturein the drying chamber is lowered to preset temperature, an electric heater in the water tank and an auxiliary heating pipe in the heating chamber are started to supplement heat needed by the drying chamber so as to allow the drying process to continue, and the heater stops working when the temperature in the drying chamber is higher than the preset temperature.