The utility model discloses a mud device is arranged on line to crude oil storage tank, including conical plate, collection mud cavity and mud pipe, conical plate fixed mounting is on the crude oil storage tank inner wall of a take the altitude bottom the crude oil storage tank, the cross sectional shape of conical plate is the triangle -shaped cockscomb structure, a plurality of heavy mud holes have been seted up at the bottom of the tooth of conical plate, a plurality of mudholes have been seted up on the flank of conical plate, a plurality of mounting holes have been seted up on the conical plate, it is a plurality of collection mud cavity is installed respectively on every mounting hole, the mud pipe includes a person in charge and a plurality of branch pipes of being connected with the person in charge, and every branch pipe is installed respectively on corresponding collection mud cavity, the crude oil storage tank setting is stretched out to the outer end of being responsible for, be provided with electric valve and sediment stuff pump on the person in charge's the outer end. The utility model discloses simple structure accessible time drives a jar interior mud, has realized arranging state that mud does not have dead angle and the normal production row's of stopping production mud not down, has lightened sewage treatment system's burden.