The invention relates to the technical field of pultrusion type section bar processing devices, in particular to online section bar cutting equipment. The online section bar cutting equipment comprises a base, a cutting sliding table, a sliding table driving part and a cutting assembly. The cutting sliding table is slidably arranged on the base, and a pultruded section bar passes on the cutting sliding table; the sliding table driving part is connected to the cutting sliding table to drive the cutting sliding table to move linearly in a reciprocating manner on the base; the cutting assembly isarranged on the cutting sliding table and forms a certain inclination angle with the cutting sliding table to cut. During cutting, the sliding table driving part drives the cutting sliding table andthe pultruded section bar to move at a same speed, and meanwhile, the cutting assembly acts to obliquely cut the pultruded section bar. By arranging the cutting sliding table, the cutting assembly andthe pultruded section bar move synchronously and keep relative rest. As the cutting assembly cuts the section bar at a preset inclination angle on the cutting sliding table, the section bar is obliquely cut and is processed and formed at one time without material waste, so that the processing time is shortened, the processing efficiency is improved and the processing cost is saved.