The utility model relates to a turning-milling combined main shaft brake device which comprises a main shaft box and a main shaft. The main shaft is arranged in the main shaft box, a brake disc is arranged on the main shaft, a support plate is arranged on the main shaft box, a shell is arranged on the support plate, a second square hole is formed in the shell, a pushing block is arranged in the second square hole and slides in the second square hole, an oil cylinder pushing rod is connected to the pushing block, a pair of forcep holders are arranged below the pushing block, a square groove is formed in each forcep holder, a brake pad is arranged in each groove, a circular hole is formed in the middle of each forcep holder, a spring is assembled at the positions of the circular holes, and the forcep holders are supported with outward tensile force of the spring. According to the turning-milling combined main shaft brake device, the brake disc is braked through the brake pads on the forcep holders, in this way, the brake mode is tighter than a traditional pressing brake mode, the service life of the main shaft is not influenced, and relatively, the turning-milling combined main shaft brake device is long in service life, stable in structure and good in brake effect.