The invention provides a forming machine for the grooves of filter sticks, which comprises components, such as a paper guiding roller, a paper guiding motor, a cardboard regulator, groove rollers, servo motors of the groove rollers, a protective cover, a PLC (Programmable Logic Controller), a touch screen and the like. The touch screen is provided with a command signal line A connected with the PLC controller, and the PLC controller is provided with control lines which are respectively connected with the servo motors of the groove rollers and the paper guiding motor. When the components are matched with a forming host machine of filter sticks for cigarettes for use, the components are additionally connected with a shaft coder, the position information of a knife head shaft of the host machine of the forming machine of the filter sticks is collected by the shaft coder, the information is transmitted to the PLC controller, and then the servo motors of the two groove rollers, the paper guiding motor and the forming host machine of the filter sticks are respectively controlled to synchronously move by the PLC controller. When a system of the forming machine for the grooves of the filter sticks stops because of the occurrence of a fault, the host machine of the forming machine of the filter sticks is controlled to stop by the PLC controller. According to the forming machine for thegrooves of the filter sticks, a program control technology and a servo control technology are adopted, the automatization degree is high, the production capacity of filter sticks with grooves is enhanced, the replacement of the specifications of the products of the filter sticks is convenient, and the maintenance is convenient when a fault occurs.