The invention provides a gas valve leak detection component and a gas valve leak detection method to detect the leak of a gas valve. The gas valve leak detection component comprises an inflation joint connected to one interface and a blocking piece for blocking other interfaces of the gas valve. The inflation joint has a one-way valve inside, and the one-way valve comprises an inflation port and a one-way valve core for blocking the inflation port under the effect of an elastic piece. The inflation joint has the one-way valve inside, the inflation port is opened by the one-way valve core when the gas valve is inflated, the inflation port is closed after the inflation is completed, the gas in the gas valve is prevented from flowing out of the inflation port, thus a sealing state in the gas valve is maintained after the inflation of the gas valve is completed, then the gas valve is in a closed space or is placed in liquid to detect the leak of the gas valve. According to the one-way valve, the inflation port can be opened by air pressure in inflation, the inflation port can be closed by the one-way valve core after an external inflation device is removed, and the gas leak in an inflation process is reduced.