Disclosed are a muzzle flame simulator and a method for generating a light trail. The muzzle flame simulator includes a projectile passage, a projectile sensor, a controller, and at least one simulating flame light source. The projectile passage is disposed inside the muzzle flame simulator. The projectile sensor is coupled to the controller and configured to send a trigger signal to the controller in response to detecting a projectile passing through the projectile passage. The controller includes a signal generator circuit, which is configured to output at least two preset periodically changing control signals. The controller is configured to start the signal generator circuit in response to detecting the trigger signal. The at least one simulating flame light source is coupled to the controller, the simulating flame light source each at least includes two illuminating components that are configured to periodically emit light based on the control signals.