NOVELTY - A thick wall of ceramic solar panel is thinned by performing conventional treatment of common ceramic; forming biscuit (bisque) of flat ceramic solar panel by extrusion using vacuum extrusion device through a flat perforated mold; drying the biscuit of groove-shaped ceramic solar panel; grinding or milling upper plane of dried biscuit of flat ceramic solar panel; thinning outer wall; covering surface of upper plane of dried biscuit of flat ceramic solar panel; and drying and firing to form thin flat wall.    USE - Method for thinning thick wall of ceramic solar panel (claimed).    ADVANTAGE - The method provides thinner wall of an absorptive surface of ceramic solar panel, which provides higher efficiency of collector of the ceramic solar panel, thus the ceramic solar panel has increased rate of finished products and high solar absorption efficiency.    DETAILED DESCRIPTION - Thinning thick wall of ceramic solar panel comprises:    (A) performing conventional treatment of common ceramic;    (B) forming biscuit (bisque) of flat ceramic solar panel by extrusion using vacuum extrusion device through a flat perforated mold, or forming biscuit of groove-shaped ceramic solar panel by extrusion using vacuum extrusion device through a groove-shaped perforated mold;    (C) drying the biscuit of groove-shaped ceramic solar panel and biscuit of flat ceramic solar panel;    (D) grinding or milling upper plane of dried biscuit of flat ceramic solar panel or inner basal surface of biscuit of groove-shaped ceramic solar panel;    (E) thinning outer wall, and covering surface of the upper plane of dried biscuit of flat ceramic solar panel or surface of inner basal surface and inner end side of the biscuit of groove-shaped ceramic solar panel with black slurry through conventional treatment; and    (F) drying and firing to form thin flat wall or thin wall composite black-ceramic solar panel.    The slurry is formed by grinding common ceramic and/or other industrial waste residue rich in transition metal elements of Group 4, natural mineral rich in transition metal elements of Group 4, compounds rich in transition metal elements of Group 4, and/or black colorants for ceramic; and performing vacuum extrusion, drying, grinding, and milling. An INDEPENDENT CLAIM is included for a thinning device for thick wall of ceramic solar panel.