Artificial dam body structure of coal mine underground reservoir and coal mine underground reservoir

The invention relates to the field of mining, and particularly discloses an artificial dam body structure of a coal mine underground reservoir and the coal mine underground reservoir, the artificial dam body structure comprises an artificial dam body arranged between adjacent coal pillar dam bodies, the long side of the trapezoidal artificial dam body faces the water storage area of the underground reservoir, and a secondary injection device is installed in the artificial dam body. The secondary injection device comprises a water inlet pipe, an anti-seepage material mixing triggering device and two anti-seepage material storage tanks, the anti-seepage material mixing triggering device further communicates with a grouting pipe, and the water inlet pipe can trigger the anti-seepage material mixing triggering device when the water pressure reaches a set threshold value; and the anti-seepage materials in the two anti-seepage material storage tanks are mixed and react to form a grouting material which is injected