The invention discloses a manual hole opener, and relates to the field of machinery equipment. The manual hole opener can clamp a plate between the base and a clamping plate when in use, an opening position of the plate is exposed in an allowable hole, an opening is formed at a position facing directly to the bottom of a hole opening cylinder, and the plate is clamped tightly by screwing nuts withthreaded columns tightly. A rotary handle is held by a hand to rotate a threaded rod in a threaded pipe, an opening cylinder rotates to form a circular hole in the plate in the allowable hole, and the hole opening cylinder passes through the plate. The manual hole opener is simple in design and low in cost, and is suitable for drilling a large-diameter circular hole in the soft plate at one time.The plate can be also stably fixed and the processing accuracy of the circular hole is guaranteed.