The vegetable chopper comprises a first conveying unit.The first conveying unit includes a first base, a first main roller, a first pair of rollers, a first supporting device, a clamping device and a first conveying belt.The first supporting device has a first movable seat which can move between a first supporting position and a first non supporting position relative to the clamping device.The clamping device can move between a certain position and a release position relative to the first base.The first movable seat is positioned at the first supporting position by moving the clamping device to the positioning position, so that the first conveyor belt is closely sleeved between the first base, the first main roller, the first auxiliary roller and the first supporting device, so that the first movable seat of the first supporting device will not move due to vibration or touch when used.一種切菜機包含一第一輸送單元。該第一輸送單元包括一第一基座、一第一主滾輪、一第一副滾輪、一第一撐抵裝置、一卡固裝置，及一第一輸送帶。該第一撐抵裝置具有一第一活動座，該第一活動座可相對於該卡固裝置在一第一撐抵位置與一第一非撐抵位置之間移動。該卡固裝置可相對於該第一基座在一定位位置與一釋放位置之間移動。利用該卡固裝置移動至該定位位置將該第一活動座定位於該第一撐抵位置，使該第一輸送帶緊密地套設於該第一基座、該第一主滾輪、該第一副滾輪、該第一撐抵裝置之間，讓該第一撐抵裝置的第一活動座使用時不會因震動或碰觸而移動位置。
