TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The preparation of YSZ slurry with high solid-phase content comprises: (i) weighing and adding zirconia powder stabilized by iridium oxide, acrylic acid monomer, initiator and water to a reactor in a certain ratio, agitating and performing surface in situ polymerization under constant-temperature; (ii) centrifuging zirconia powder body (YSZ) stabilized by iridium oxide performed surface in situ polymerization and washing with water; (iii) weighing the washed zirconia powder body (YSZ) stabilized by iridium oxide after performing surface in situ polymerization, polyvinyl alcohol-B1070 emulsion composite binder, a plasticizer, polyethylene glycol and a solvent water, and adding in a ball mill tank and ball-milling; (iv) ball-milling and mixing the slurries, degassing, and preparing the slurry into a compact electrolyte membrane by casting; (v) weighing the zirconia powder body stabilized by iridium oxide, nickel(ii) oxide to form a material, regulating ink oil and the plasticizer to obtain a compact anode pug; (vi) preparing the compact anode pug into a compact anode membrane by film rolling formation; (vii) thermally pressing and laminating the compact electrolyte membrane and the compact anode membrane to obtain anode support/thin-layer compact electrolyte composite membrane; (viii) sintering to obtain anode support/thin-layer electrolyte composite diaphragm. The preparation of the anode support/thin-layer electrolyte composite diaphragm comprises high-temperature sintering for 2-10 hours at 1300-1450 degrees C. The plastic removing is carried out at 450-650 degrees c and the temperature increasing rate is 0.5-1 degrees c/minute. The slurry of the step (iii) is further added with a dispersant, a binder and a plasticizer. The YSZ particle surfaces are polymerized by the action of ammonium sulfate, acrylic acid monomer molecules attached to micron, submicron and nano-level YSZ particle surfaces. The dispersion in situ polymerization comprises attaching a monomer layer of radicals with different degrees of water wettability and different space steric hindrances from the particle surface of the powder body and adding the initiator ammonium sulfate to perform in situ polymerization.