The invention discloses a 75 kW continuous wave magnetron. The 75 kW continuous wave magnetron comprises a positive pole cavity combination (1), a negative pole lead wire combination (2), a water pipe (3) which is connected with the positive pole cavity (1), an output window combination (4) which is connected with the negative pole cavity combination (1), an antenna combination (5) which is fixed on the negative pole cavity combination (1), and an inner pole shoe (6) which is fixed at one end of the positive pole cavity combination (1), wherein the antenna combination (5) is located inside the output window combination (4). The continuous wave magnetron is reasonable in structural design, high in power, high in output efficiency, less in microwave leakage, and high in safety performance. Particularly, due to the fact that a negative pole structure of a fan-shaped resonator system structure with high characteristic impedance is adopted and an n-shaped water line cooling structure is adopted on a negative pole, heat dissipation effect is better, light striking probability is less, working is stable, structure is novel, and the magnetron is suitable for being used in a high-power microwave heating device in industries.