The utility model discloses a mould of small -size roof beam test piece of preparation emulsified asphalt mixture, outer deckle board of rut examination mould and bottom collecting tank board concatenation equipment moulding utensil cavity, the mould cavity is inside to be cut apart into a plurality of independent liquid collecting cavity rooms in turn and is feeded the cavity by the positioning troughed plate of symmetry setting and the baffle of pegging graft between positioning troughed plate, be equipped with the outage that link up the liquid collecting cavity room and the cavity of feeding on the baffle, the fastening of top board one side has and feeds the corresponding last pressure head of cavity figure, should go up the pressure head cooperates and reserves and roll the surplus with the cavity embedding of feeding respectively, be equipped with at least one collecting tank with the liquid collecting cavity relative position in room on the collecting tank board of bottom. Theutility model discloses easy dismounting, a plurality of small -size roof beam test pieces of one shot forming, complete extracting, the compaction is even, and the mould can be disassembled after experimental the completion, rinses emulsified asphalt mixture's residual, makes things convenient for carrying out of follow -up test project, has improved experimental quality and efficiency greatly.