The invention provides a building floor construction method which comprises the steps that the surface of a base layer of a building floor is cleaned, the surface of the base layer is divided into a first preset base layer, a second preset base layer and a third preset base layer, wherein the cleaning operation of the surface of the base layer at least comprises floating soil cleaning, mortar cleaning and residual liquid cleaning; a block material is laid on the first preset base layer, wherein the block material comprises at least one of a floor tile, a cylinder tile, a ceramic wool tile anda vitrified tile; an anti-static floor is laid on the second preset base layer; and concrete is laid on the third preset base layer. According to the building floor construction method, the problem that ground hollowing occurs by adopting a building ground construction method in the prior art is solved.