The invention provides a mouse trap without bait, comprising: main body cover (1),overhang door(6), door line (7), door ridge (3), switch board (4), on-off lever (5) and the lever limit support (9), etc. The main body cover is in rectangular shape, the two ports are the door of the mouse trap, the overhang door(6) is installed near the door upon the two ends of the main body cover, the door ridge (3) is installed near the door below the two ends of the main body cover, the switch board (4) is installed inside the lower middle of main body cover (1), the switch board (4) is connected with one end of the on-off lever (5), one end of the two door line (7)is connected with the top(8) of the on-off lever, and the other end is connected with the overhang door. The invention is characterized by the simple structure, the convenient use and no pollution, the mouse can be trapped without the use of poison and bait, and is suit for mousetrap in the door, field and in the grassland and other environment.