Variable cross-section assembly type underground diaphragm wall

The invention discloses a variable cross-section fabricated underground diaphragm wall, relates to the technical field of underground diaphragm walls, and aims to solve the problems of low section utilization rate and serious material waste of a uniform-section diaphragm wall component caused by the fact that the existing diaphragm wall is not specifically designed or constructed in combination with the stress characteristics of the diaphragm wall. A standard section component and a non-standard section component are arranged in the cement soil continuous wall, a conversion connector is arranged between the standard section component and the non-standard section component, the conversion connector comprises a connector box and micro-expansion concrete, and the two ends of the connector box are provided with an embedded assembly and a water stop assembly respectively. The anti-seepage wall is more reasonable in stress, the section utilization rate of the prefabricated parts is increased, the engineering cost o