The utility model discloses a molecular sieve absorbs drying device, including controlling means, reation kettle, with reation kettle form a pipeline loop one -level molecular sieve filtration device, form the 2nd pipeline loop's second grade molecular sieve filtration device with reation kettle, last agitating unit and the liquid level warning alarm device of being equipped with of reation kettle, be equipped with code decoding device in the controlling means, the controller forms the communication with agitator motor, liquid level warning alarm device and temperature -detecting device respectively through code decoding device and is connected. The utility model discloses structural design is simply reasonable, through the mutual information transmission control of controlling means with temperature -detecting device, masters the steam boiling point in real time, controls opening and closing of different solenoid valves according to the difference of boiling point to collect or increase reactant or result, control the process of organic reaction.