A thin-frame type injection mold is disclosed. A tank body includes a rack and a plurality of layers of molds. Each mold includes an internal mold and an external mold which are matched. Tail ends ofthe internal molds are connected to the central shaft of the rack, and front ends of the internal molds are assemblied with the external molds to form mold cavities and a runner. Bottoms of the frontends of the internal molds extend to form base plates for accommodating the external molds. Along the axial direction, the tank body includes an injection molding zone, an air cooling zone, a water cooling zone, an air cooling zone and a workpiece picking-up zone in order which are equal in angle. The top of the injection molding zone is provided with an injection molding hole. The runner in series connection with the molds is disposed in the rack. In the water cooling zone, a condensation pipe is disposed in the rack. Through internal and external molds having '<' shaped cuts, the cuts are runner cavities and the mold cavities so that mould assembling and disassembling are facilitated, and an injection molding fluid can flow conveniently. Through tank body partition, injection molding andcondensation are integrated, and the injection mold can be recycled. Through the multi-layer mold cavities in series connection through the runners, the injection molding efficiency is increased. Theinjection mold is simple in structure, convenient to use, high in injection molding efficiency, simple to demould, high in practicability and wide in applicability.