The utility model provides a preparation device of organic sodium alcoholate solution. The preparation device comprises an organic alcohol storage tank, a sweeping air channel, a reactor, a condenser and a blending tank. The organic alcohol storage tank is connected with the reactor through a feeding pipe, and a feeding control device is arranged on the feeding pipe; the sweeping air channel is connected with the reactor, and the condenser is arranged on the top of the reactor; the blending tank and the bottom of the reactor are connected through a discharging pipe which is provided with a discharging control device. The improved preparation device is simple in structure, convenient to cast and mount, high in universality and especially suitable for a catalyst system of the polyether industry. Organic sodium alcoholate obtained by the preparation device can greatly improve the quality of polyether products, the quality level of the polyether industry even the polycarboxylic acid industry can be improved, and the industrial application prospects are wide.