The utility model discloses a novel central valve type brake master cylinder, which comprises a cylinder body, a first piston, a second piston, a first central valve and a second central valve, the first central valve and the second central valve are cylinders with annular bulges, and O-shaped sealing rings are sleeved on the cylinders. According to the brake master cylinder, the central valve isadopted to replace a compensation hole, so that leather cup abrasion caused by frequent contact between a leather cup on the piston and the compensation hole is avoided, and the service life of the brake master cylinder is greatly prolonged; and the center valve in the brake master cylinder is simple in structure and high in sealing effect, the manufacturing process of the complex structure of thecenter valve is greatly simplified, and the manufacturing cost is reduced.