The present invention provides a hidden type split hinge. First and second curved tracks are provided on a curved seat body for respectively limiting a first and second curved blocks of first and second rotating members in a way of being relatively swung. First and second torsion units are symmetrical and adjacently provided to a first side of the curved seat body, and one end of the first and second torsion units is respectively provided with first and second pivoting holes, and the first and second pivoting holes are respectively in communication with first and second elongated opening holes, first and second tooth portions are respectively provided around peripheries of the first and second pivoting holes, and the first tooth portion is engaged with the second tooth portion, and the first and second pivoting hole are axially connected to the first and second shaft ends of a first lateral surface.
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