Pedal travel simulator, drive-by-wire hydraulic braking system and vehicle

The utility model provides a pedal travel simulator, a drive-by-wire hydraulic braking system and a vehicle. The pedal travel simulator comprises a simulator body, a simulator cylinder cover, an elastic assembly and a piston assembly. A simulator cylinder is formed in the simulator body, the simulator cylinder and a hollow simulator cylinder cover form a containing space, the elastic assembly is contained in the hollow simulator cylinder cover, the piston assembly is arranged in the simulator cylinder and can move in the axial direction of the simulator cylinder, and one end of the piston assembly abuts against the elastic assembly in a pressed mode. A through hole is formed in the piston assembly and used for communicating the two axial sides of the piston push rod. According to the pedal travel simulator, the through hole is formed in the piston assembly, so that the overflowing section area of fluid in the simulator is increased, small flow resistance is guaranteed when the piston of the simulator moves rapidly, and the problem that the simulator is clamped when the piston moves rapidly is solved.