The invention discloses a unit bathroom splicing type bottom plate. The unit bathroom splicing type bottom plate structurally comprises main splicing plates, through openings and buckles, wherein thethrough openings and the main splicing plates are of an integrated structure, the buckles are fixed to the outer surfaces of the main splicing plates, and when the main splicing plates are trimmed, pulling cores connected between the main splicing plates are distributed and installed according to the intervals of the through openings; the pulling cores connected between supporting rods can move positions of close ports, the center positions of the middles are fixed through middle balls, thereby providing a certain moving space for connecting parts; arc strips can play a certain degree of extension according to pulling of pulling-back strips, and when the bottom plate is trimmed into the needed shape, the tenacity is properly stretched for good trimming, and the loosening of the bottom plate is prevented; an outer ring of a shell of each internal middle ball can be extruded by the outer side, the position of each core is fixed by the middle core, the hard force of the center is fixed, the movement range is limited to the maximum extent by a limiting edge, and the pulling positions can be extruded to abut against the relative position in a counter-force mode when the joint parts arecombined.