The invention discloses an efficient heat dissipating mobile phone middle frame comprising an inner frame, wherein the inner frame is provided with a rectangular frame composed of two groups of side plates and two groups of connecting plates, heat dissipating holes are equidistantly formed in the two groups of side plates, semiconductor cooling fins are arranged in the heat dissipating holes, heatdissipating windows are arranged on the two groups of connecting plates, an outer frame is connected to the outer side of the inner side in a sliding manner, the outer frame comprises a first frame and a second frame, both of the first frame and the second frame are U-shaped frames, guiding slide blocks are fixed to both ends of the first frame and the second frame via screws, and guiding chutesmatched with the guiding slide blocks are formed in the inner frame. The efficient heat dissipating mobile phone middle frame disclosed by the invention has the advantages of simple structure and novel design, can reduce the impact force of the mobile phone during accidental drop at a non heat dissipating state, when the middle frame is changed, only the outer frame is changed, thereby being convenient to change, the outer frame is dismounted and bent in the heat dissipating state so as to accelerate the heat dissipating of the mobile phone, so that the heat dissipating effect is better, and the service life of the mobile phone is prolonged.