The invention discloses a diurea-based wax aggregate and a preparation method thereof. The diurea-based wax aggregate comprises the following raw materials in parts by mass: 0-90 parts of lubricant base oil, 5-95 parts of wax, 0-10 parts of additive and 5-35 parts of diurea-based thickener. The preparation method of the diurea-based wax aggregate comprises the step of thickening a wax-base oil system via the diurea-based thickener obtained by reaction of diisocyanate and organic monamine. The prepared diurea-based wax aggregate has high dropping point and small oil separation quantity, is non-flowing semi-fluid within the range above the melting point of the wax to 250 DEG C, improves the dropping point of the wax, and can effectively solve the problem of high-temperature flowing melting of wax in many fields.