The invention relates to a centroid suspension simulation test platform with three degrees of freedom. A suspension chamber system is a hollow cylindrical chamber body; a suspension point is arranged in the central inner part of the chamber body; a spacing ring is arranged right above the suspension point; screws are installed in the axial direction, the radial direction and the normal direction around the suspension point; an adjustable balancing weight is installed on each screw; tested equipment is installed at the back part of the chamber body; a guiding head or other tested equipment is installed at the head of the chamber body; a fixed balancing weight is installed on the outer wall of the chamber body; a centroid suspension system comprises a rigid rod and a three-direction bearing; the upper end of the rigid rod is fixed on a roof beam of a laboratory; the lower end of the rigid rod is fixedly connected with the three-direction bearing; the rigid rod passes through the spacing ring of the suspension chamber system; the lower end of the three-direction bearing is fixedly connected with the suspension point in the central part of the suspension chamber system; a cold spray system comprises a nozzle assembly, a hard air pipe and two pressure-accumulating air cylinders; the two pressure-accumulating air cylinders are installed at the outer two sides of the suspension chamber system; the cold air nozzle assembly is installed at the tail outside the suspension chamber system; and the pressure-accumulating air cylinders and the air path interface of the nozzle assembly are connected by the hard air pipe.