Preparation method of low-molecular-weight polyacrylamide

The invention discloses a preparation method of low-molecular-weight polyacrylamide. The preparation method of the low-molecular-weight polyacrylamide comprises the following steps of: putting acrylamide and an initiator into a reaction vessel; dissolving with mixed liquor comprising absolute ethyl alcohol and water; stirring and heating to a certain temperature; and cooling, performing suction filtration, washing and drying to a constant weight to obtain a product, and the like. Due to the adoption of the preparation method, the low-molecular-weight polyacrylamide can be synthesized successfully, synthesis efficiency is high, synthesis steps are simple, and synthesis cost is reduced; and the synthesized polyacrylamide has low molecular weight and narrow molecular weight distribution.