The utility model relates to a powerless instant solution settling device, which is used for dissolving salt, and the powerless instant solution settling device needs not additional motive power to stir. The powerless instant solution settling device is provided with a first level rhombic settling box B in a dissolving box; the settling box B is welded with a closed-top filtering funnel, wherein, a bell-mouth body 8 on the funnel extends into the settling box; a neck body which is as a screen drum 3 is arranged in the dissolving box; a water inlet pipe m which passes through the funnel from the upper part of the dissolving box is communicated with a thick pipe 4 which is provided with two plugging ends in the long axis direction; the thick pipe 4 is provided with the water outlet row of the transversal thin pipe 9 which extends into a box A; the box B is communicated with a secondary settling box C through a pipe n, and the secondary settling box C is provided with an inclined pipe row. In addition, each box is provided with a dirt discharging pipe t. The powerless instant solution settling device has the advantages of fast dissolving and settling speed, a power device is not additionally provided, and the energy can be saved.