The invention discloses a functional module based on a dental hospital diagnosis and treatment reservation system, which comprises a manager management functional module and a patient access part functional module, wherein the manager management functional module comprises a reservation condition display module, a patient data management module, a doctor home visit time setting module, a doctor setting module, a mail setting module, a mail sending processing module and a system exit module; and the patient access part functional module comprises a reservation condition checking module, a patient registered user module, a registration information modification module, a password retrieval module, a reservation module and a reservation cancellation module. The functional module based on the dental hospital diagnosis and treatment reservation system enables the patient to accurately understand doctor reservation conditions of each dental hospital, select an appropriate doctor and time period, see the doctor on time within the determined reservation time period and be free from the trouble of time wasting; and the functional module can also schedule a doctor to pay a home visit according to specific patient requirements, so that resources of the medical system are utilized to be greatest extent.