The invention discloses an engine revolution speed fixing device. The engine revolution speed fixing device comprises an angle stopping block, a control lever, an angle limiting groove and a control lever base. The control lever base is fixed to any vertical angle position of a pedal mounting plate located on the back side of a pedal. A through groove allowing the control lever to be mounted is formed in the top face of the control lever base, and the through groove and the control lever base are movably connected through a pin shaft. The angle limiting groove is fixed to the side wall of thecontrol lever, and multiple clamping grooves tilting upwards from the side wall surface are formed in the angle limiting groove at intervals from top to bottom. The angle stopping block is composed ofa cylindrical body and a limiting piece fixed to the outer side end of the cylindrical body so that the pedal can be arranged in the different clamping grooves through the angle stopping block, and the pedal can be fixed at different trampling angles. By adoption of the engine revolution speed fixing device, vehicle engines can be kept to operate at a high revolution speed as required in the operational process of a driver, and the driving intensity of the driver is relieved.