The invention discloses a preparation of a CoFe2O4 spinel type brown black nano-ceramic pigment. The preparation of the CoFe2O4 spinel type brown black nano-ceramic pigment comprises the steps of dissolving transition metal cobalt salt, transition metal ferric salt, a complexing agent, an esterifying agent and a dispersing agent in distilled water; regulating the pH value of the distilled water to be neutral to form a sol solution; heating the sol solution and evaporating solvents in the sol solution to obtain xerogel; then igniting the xerogel in the air by using an igniter composition so that the xerogel is rapidly combusted in a self-propagating manner to form dark brown self-propagating powder; finally, the self-propagating powder is calcined to obtain the CoFe2O4 spinel type nano-ceramic pigment with uniform components, high purity and better crystal structure. The CoFe2O4 spinel type nano-ceramic pigment is mixed together with an organic binding agent and an organic solvent and the obtained mixture is sprayed to a metal base material after being ball-milled and dispersed so as to obtain a brown black ceramic solar light absorbing coating; therefore, the types of the solar light absorbing coatings are enriched to be conductive to the application of the spinel type ceramic solar light absorbing coating in solar outdoor buildings.