The invention discloses a house building floor structure. According to the key points of the technical scheme, the house building floor structure comprises a wooden floor component, a plurality of main keels are connected below the wooden floor component, a plurality of support components are connected below the main keels, the support components comprise upper support blocks detachably and slidably connected to the main keels in the length direction, lower support blocks are detachably and slidably connected below the upper support blocks, and the sliding directions of the lower support blocks are perpendicular to the sliding directions of the upper support blocks. The house building floor structure has the function of conveniently changing the position of a threading channel in a keel assembly according to the mounting direction of an electric wire and thus facilitating mounting for people.