The invention discloses a rocker arm, a variable valve driving mechanism provided with the same as well as an engine. The rocker arm comprises a main rocker arm body, at least two servo pistons arranged in the main rocker arm body as well as a control valve used for controlling oil charge and oil drainage of the servo pistons; a first control oil line is arranged on the main rocker arm body, one end of the first control oil line is communicated with a lubricating oil channel of a rocker arm shaft, the other end is communicated with an oil inlet of the control valve, a check valve used for preventing oil from flowing back to the lubricating oil channel is arranged in the first control oil line, the oil can be prevented from flowing back, so that independent high-pressure oil cavity functionof each servo piston can be realized, and influence of oil pressure fluctuation among different cylinders is avoided.