The invention relates to the technical field of power and electronics, and especially relates to an AC-DC hybrid circuit breaker. The circuit breaker comprises a high-speed mechanical switch which is connected with a main loop and is used for carrying out the high-speed disconnection of the main loop; a first diode, a second diode, a first thyristor and a second thyristor; an inductor and a capacitor, which are connected in series. The first and second thyristors are used for controlling the charging and discharging of the capacitor according to the current direction of the main loop. One end, departing from the inductor, of the capacitor has a high voltage, so as to carry out the discharging through the high-speed mechanical switch and then carry out the reverse charging. The circuit breaker also comprises an energy absorbing branch circuit which is used for switching from a first state to a second state when the received voltage is higher than a set value, so as to reduce the current of the main loop to a safety current value. The invention also discloses a control method for the above circuit breaker. The circuit breaker can reduce the conduction loss of a system, reduces the thermal design difficulty of a solid-state circuit breaker, greatly reduces the wrong touch possibility of a controllable device, improves the reliability of the system, reduces the cost of the system, and speeds up the operation speed of the circuit breaker.