An immunodetection probe comprises a needle structure having a compartment and configured to be inserted into an organic tissue, a dialysis membrane configured to isolate the compartment from the organic tissue, a detection device having a detection portion and a plurality of receptors, a first optical fiber coupled to the needle structure, and a pair of tubes connected to the compartment. The plurality of receptors are disposed on an end surface of the detection portion for conjugating target antibodies, wherein the detection portion is disposed in the compartment. The first optical fiber is configured to introduce light incident on photo-induced molecules adjacent to the end surface of the detection portion so as to cause a change in the pH level of the solution adjacent to the end surface of the detection portion. The pair of tubes is configured to transport the solution containing the photo-induced molecules into the compartment.