The invention discloses a high-speed paper conveyer. The high-speed paper conveyer comprises a paper conveyer body, a dual-ventilation paper separation suction nozzle, a conjugate cam presser foot assembly, an air valve capable of being fast disassembled and other conventional mechanisms; the paper conveyer body is provided with a shell body, and the shell body is provided with the technologically-improved dual-ventilation paper separation suction nozzle, the conjugate cam presser foot assembly and the air valve capable of being fast disassembled; the dual-ventilation paper separation suction nozzle is provided with two ventilation ports, and a suction rod is located at the lower end on the condition of not carrying out ventilation under the effect of pressure springs; on the condition of sucking paper, the upper port is at negative pressure, the suction rod is moved upwards, and the paper is lifted; on the condition of releasing the paper, the negative pressure of the upper port is removed, the suction nozzle releases the paper, the paper is moved by a paper transferring mechanism, the suction rod does not fall and does not scratch the paper, the paper leaves the position below the suction nozzle, then positive pressure of the lower port is removed, and the suction rod falls and returns to the original state; a conjugate cam rotates around a base and pushes a swinging rod and the base to swing, the base drives a presser foot, the presser foot is retracted when stepping on the paper and extends out under the effect of a second pressure spring when not stepping on the paper, air blowing is carried out, and the air valve capable of being fast disassembled avoids the problems that traditional air valves are easily jammed and are difficult to disassemble when needing regular cleaning and maintaining.