The invention relates to a coal-fired reversal combustion multiple-return-stroke environment-friendly hot water boiler. A boiler body is provided with a jacketed boiler wall, a reversal combustion hearth is arranged on the lower portion of the front side of the boiler body, and an ash slag chamber is formed below a circular pipe fire grate below the reversal combustion hearth; a lower fire grate is arranged below the ash slag chamber, the rear side and upper portion of the interior of the boiler body are provided with a column pipe and a jacketed baffle plate which are communicated with the jacketed boiler wall, a smoke discharging port is formed above a convective heat exchange device in the boiler body, vertical threaded smoke pipes are arranged in the rear wall of the jacketed boiler wall, and a lower smoke box is arranged below the rear wall of the jacketed boiler wall; upper pipe openings of the threaded smoke pipes are communicated with the smoke discharging port above the boilerbody, lower pipe openings of the threaded smoke pipes are communicated with the lower smoke box, and the lower smoke box is provided with a smoke outlet. The threaded smoke pipes are arranged in therear wall of the jacketed boiler wall so that heat in flue gas can be effectively recovered, and the thermal efficiency of the boiler is high. The threaded smoke pipes have a large heat transfer capacity, so that steel materials are saved, and the cost is reduced; the threaded smoke pipes have a self-cleaning effect; fresh fuel drops to the lower fire grate and can be combusted continuously and sufficiently when burnt red coal is formed on a slag layer of the circular pipe fire grate, so that coal consumption is reduced.