A mold for rain gutters is disclosed. The disclosed rainwater catcher mold comprises a first body plate composed of a first plate and a second plate bent at right angles to the first plate; A second body plate formed of a third plate and a fourth plate bent at right angles to the third plate, the second body plate facing the first body plate to form a rectangular tube shape; A first corner plate and a second corner plate installed to cover spaces between both ends of the first main plate portion and both side ends of the second main plate; A first turnbuckle part which is formed to connect the first plate and the third plate facing each other and is adjustable in length by a user's manipulation and is capable of adjusting a distance between the first plate and the third plate,; And a second plate that is formed to connect the second plate and the fourth plate facing each other and is adjustable in length by a user's manipulation to adjust a distance between the second plate and the fourth plate, Wherein when the distance between the first body plate and the second body plate is increased according to the adjustment of the lengths of the first turnbuckle and the second turnbuckle including the turnbuckle, 2 body plate is tightly fixed to the inside of the rainwater receiver, and when the distance between the first body plate and the second body plate is reduced, the first body plate and the second body plate can be separated from the inside of the rainwater receiver State.;
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