The invention discloses a six-free-degree 3-3 orthogonal type parallel robot which comprises a motion platform, a fixed framework and a mechanical branch chain set, wherein the mechanical branch chain set is arranged between the motion platform and the fixed framework and connected with the motion platform and the fixed framework, the mechanical branch chain set comprises six mechanical branch chains in 3-3 orthogonal arrangement. The 3-3 orthogonal arrangement refers to that the six mechanical branch chains are divided into two sets, and each set comprises three mechanical branch chains. The axes in the three driver directions of the three mechanical branch chains in the first set are positioned in the same plane surface, and each two axes form a 120-degree angle but do not cross at one point; the axes in the three driver directions of the three mechanical branch chains in the other set are parallel to one another, but do not in the same surface, and the axes are in pairwise orthogonal with the axes in the direction of the three mechanical branch chains in the first set. The six-free-degree 3-3 orthogonal type parallel robot provided by the invention has the advantages of high system rigidity, high positioning accuracy, excellent dynamic response property, excellent isotropy of mechanical properties such as rigidity, bearing and the like, small occupied space, low energy consumption, long service life, low manufacturing cost, less maintenance cost, zero contamination and the like.