The invention provides a continuous hydrolyzing device. The continuous hydrolyzing device comprises a reboiler, a rectifying tower and a condenser. A catalyzing section is arranged in the rectifying tower and provided with a sold acid catalyst, a material feeding port is formed in the catalyzing section on the rectifying tower, the reboiler is communicated to the catalyzing section, and the condenser is communicated to the top of the rectifying tower. The continuous hydrolyzing device has the advantages of being capable of carrying out continuous reactions, small in occupied area, short in hydrolyzing time, capable of reducing energy consumption and reducing potential safety hazards and the like.