The present invention relates to a submersible power generation platform. A submersible power generation platform according to a first embodiment of the present invention comprises: a generation unit (10) comprising blades (11) and a power generator (13), wherein the blades (11) rotate by being vertically disposed with respect to the flow direction of flowing water and the power generator (13) receives rotation force of the blade (11) to generate electricity; a frame (20) for fixing the generation unit (10) thereinside such that the blades (11) are disposed toward the front portion into which the flowing water flows; a pair of buoyant bodies (30), disposed on both sides of the frame (20), for floating the frame (20) using buoyancy; and at least one fixing rope (40) which fixes and connects the buoyant bodies (30) to a waterway, and has one end connected to a balance center portion (30a) on one face of the buoyant body (30), in which the balance center portion (30a) is determined considering the weight and buoyancy of the generation unit (10), the frame (20), and the buoyant bodies (30), and the flow rate of the flowing water, in order to maintain the balance of the frame (20), wherein the buoyant bodies (30) connected to the fixing rope (40) rise and fall in water such that the blades (11) rotate at a predetermined flow rate varying according to the depth of the water, and are positioned at a predetermined water depth.