The invention relates to an automatic type detonation-hindered flame arrester, which belongs to the technical field of chemical engineering machinery. The automatic type detonation-hindered flame arrester is characterized in that: the flame arrester comprises a sensitization element, a control circuit, an actuating mechanism, a sliding flame retardant core mechanism, a power mechanism and a resetting mechanism, wherein the sensitization element consists of optical fibers, a metal pad and upper part and lower part sealing gaskets; an electric control mould box of the control circuit contains asilicon photodiode, a single-chip microcomputer, and a signal transmitter which is used when the resetting mechanism is manual; the single-chip microcomputer detects, receives and times electric signals from the silicon photodiode and the signal transmitter and controls the starting of external and internal electric control sticking points; the actuating mechanism is the internal and external electric control sticking points; the sliding flame retardant core mechanism consists of a flame retardant core and a flame arrestor casing; the power mechanism is a bursting power source such as a big spring; and the resetting mechanism comprises a metal chain, a fixed rotating shaft, a mobile rotating shaft and a power source. The automatic type denotation-hindered flame arrester has the advantagesthat: the flame arrester cannot only extinguish flame to realize the aim of flame retardation if the flame exists, but also have nearly zero resistance to gas if no flame exists.