The invention discloses an out-fitting multipurpose distometer. The out-fitting multipurpose distometer comprises two propping plates, two left pile washing-out tubes, two right pile washing-out tubes and two tightening devices, wherein the two propping plates are used for propping against or clamping objects to be measured; one ends of the two left pile washing-out tubes are connected to the plate surface of one of the propping plates; one ends of the two right pile washing-out tubes are connected to the plate surface of the other propping plate, the other ends of the right pile washing-out tubes are arranged at the other ends of the left pile washing-out tubes in an embedding and sliding manner, and measurement scales are arranged on the outer surfaces of the right pile washing-out tubes; one ends of the tightening devices sleeve and are connected to the other ends of the left pile washing-out tubes, and the other ends of the tightening devices are clamped at the other ends of the right pile washing-out tubes. The out-fitting multipurpose distometer is simple to operate and small in size, can visually conduct measurement in a complicated space, facilitates positioning and adjusting and is high in precision; the safety is high, meanwhile, the mounting period is shortened and the mounting efficiency is greatly improved.