The invention provides a wooden door assembling structure which comprises a door leaf framework, door stripes and split door core plates. The door stripes are assembled on the split door core plates, contact surfaces of the door strips and the split door core plates can be attached tightly, and one door stripe and one split door core plate are assembled together to form an assembly part. The assembly parts need to be installed on two sides of the door leaf framework, the assembly part on one side is installed in the door leaf framework, due to the fact that the assembly part on one side is installed independently, a space is reserved in the back face of the assembly part, and outer contact seams of the assembly part and the door leaf framework can be attached tightly. The assembly part on the other side is installed in an installation hole of the corresponding door core plate of the door leaf framework, due to the fact that the sum of the sizes of the two split door core plates is smaller than the size of a traditional independent door core plate by a certain number, a space is also reserved on the back face of the assembly part installed on the last side, and contact surface seams of the assembly part and the door lead framework can be attached tightly. After installation, the door leaf framework, the door stripes and the split door core plates can be simultaneously attached tightly.