The utility model relates to the technical field of chemical production. The utility model relates to a production system, in particular to a production system of paraformaldehyde with low polymerization degree. Depolymerization kettle, the top of the depolymerization kettle is sequentially communicated with a filter and a total reflux condenser; the total reflux condenser is sequentially communicated with a first condenser and a first gas-liquid separator through pipelines; the bottom of the depolymerization kettle is communicated with the concentration kettle through a pipeline; the top of the concentration kettle is sequentially connected with a second gas-liquid separator, a second condenser, a first liquid receiving kettle, a third condenser and a second liquid receiving kettle through pipelines, the second condenser comprises a first condensation part and a second condensation part, and the included angle between the first condensation part and the second condensation part is 90degrees. The low-polymerization-degree paraformaldehyde content of the low-polymerization-degree paraformaldehyde production device meets the national qualified product standard.