The invention discloses a plant trunk modeling device for gardening use. The plant trunk modeling device comprises a frame (1), the upper part of which is connected with an installing plate (2). One side of the installing plate (2) is connected with multiple vertically-distributed limiting pieces (4) by means of multiple screw rods (3). Each limiting piece (4) is connected with the installing plate (2) by means of two horizontally arranged screw rods (3). Each screw rod (3) is connected with a roller (5), the circumference of which is provided with a curved surface (6). Each roller (5) is located between the installing plate (2) and each limiting piece (4). Positions, corresponding to the screw rods (3), of limiting pieces (6) and the installing plate (2) are provided with waist holes (7). Positions, corresponding to the waist holes (7), of the installing plate (2) are provided with scale lines. The plant trunk modeling device for gardening use has following advantages: damage to plant is prevented; and plant trunk modeling device is convenient to use and has good modeling effect.