A cutting tool for cutting with a guide device being provided with a guide surface, wherein the cutting tool comprises: a housing; a motor, accommodated in the housing; a transmission mechanism being configured to be connected to the motor and used for driving a saw blade, wherein the saw blade is provided with a saw blade plane; base plates connected to the housing and a connecting mechanism disposed between the baseplates; wherein: the base plates comprise a first base plate provided with a first bottom surface and a second base plate provided with a second bottom surface, wherein at least one of the first base plate and the second base plate is provided with an abutting surface (140,146) coplanar with the saw blade plane for being matched with the guide surface, and the first base plate and the second base plate are relatively movable to expose the abutting surface; the first baseplate is provided with a saw blade groove for the saw blade to pass through, the saw blade groove having an opening; the connecting mechanism is disposed between the first base plate and the second base plate, such that the first bottom surface has a first position coplanar with the second bottom surface and a second position non-coplanar with the second bottom surface; and in the first position, the second base plate closes the opening of the saw blade groove. a housing; a motor, accommodated in the housing; a transmission mechanism being configured to be connected to the motor and used for driving a saw blade, wherein the saw blade is provided with a saw blade plane; base plates connected to the housing and a connecting mechanism disposed between the baseplates; wherein: the base plates comprise a first base plate provided with a first bottom surface and a second base plate provided with a second bottom surface, wherein at least one of the first base plate and the second base plate is provided with an abutting surface (140,146) coplanar with the saw blade plane for being matched with the guide surface, and the first base plate and the second base plate are relatively movable to expose the abutting surface; the first baseplate is provided with a saw blade groove for the saw blade to pass through, the saw blade groove having an opening; the connecting mechanism is disposed between the first base plate and the second base plate, such that the first bottom surface has a first position coplanar with the second bottom surface and a second position non-coplanar with the second bottom surface; and in the first position, the second base plate closes the opening of the saw blade groove. the base plates comprise a first base plate provided with a first bottom surface and a second base plate provided with a second bottom surface, wherein at least one of the first base plate and the second base plate is provided with an abutting surface (140,146) coplanar with the saw blade plane for being matched with the guide surface, and the first base plate and the second base plate are relatively movable to expose the abutting surface; the first baseplate is provided with a saw blade groove for the saw blade to pass through, the saw blade groove having an opening; the connecting mechanism is disposed between the first base plate and the second base plate, such that the first bottom surface has a first position coplanar with the second bottom surface and a second position non-coplanar with the second bottom surface; and in the first position, the second base plate closes the opening of the saw blade groove.