Modularized assembly type intercepting well capable of achieving quantitative discharging

The modular assembly type intercepting well comprises a fixed well body, a movable well body, a bottom well body and a sliding block, a sleeve base is fixedly installed at the top end of the fixed well body, the movable well body is connected to the surface of the sleeve base in a sleeved mode, a top cover is installed at the top end of the movable well body, and the bottom well body is connected with the sliding block in a sleeved mode. And attaching grooves are formed in the two sides of the movable well body, positioning blocks are attached to the interiors of the attaching grooves, and the bottom ends of the positioning blocks are fixedly connected with the sleeve base. The modular assembly type intercepting well capable of quantitatively discharging is provided with a positioning rod, a sliding block, a metal base, a floating ball, a magnetic attraction ring and a linkage plate, so that in the using process of the intercepting well, when the liquid level reaches a certain height, the floating ball can be