The invention discloses a cross section water sampler of water supply and drainage equipment, structurally comprising a stirring suction structure, water samplers, a housing and a chassis, wherein thechassis is arranged on a bottom end face of the inner part of the housing, the stirring suction structure is mounted right above the chassis, two or more water samplers are uniformly mounted on and communicated with an outer edge of the stirring suction structure, the stirring suction structure is provided with a travel switch system, closed structures, a rotary structure, a clamping drive structure, a pressing-down structure and a suction structure, the closed structures close passages between the stirring suction structure and the water samplers, and further start the clamping drive structure, so that the travel switch system is completely electrified and the suction structure sucks water in a settling basin, the pressing-down structure lifts to drive rotary vanes to press down and achieves a suppressing effect, the rotary vanes cannot be affected by water flow generated during stirring, and the stability is improved. Stirring and sample suction are integrated, multiple samples aresimultaneously extracted, the experiment efficiency is improved, and accurate experimental data is provided for constructing the basin.