Double-pump-head mechanical diaphragm metering pump

The utility model relates to the technical field of diaphragm metering pumps, and discloses a double-pump-head mechanical diaphragm metering pump which comprises a machine shell, the inner side of the machine shell is movably connected with a worm used for transmitting power of an external motor, and the interior of the machine shell is movably connected with a worm gear used for transmitting power of the worm. An eccentric wheel used for transmitting power of the worm gear is movably connected into the machine shell. Meanwhile, a sliding rod slides to enable hydraulic diaphragms in hydraulic shells on the left side and the right side of a machine shell to deform, the hydraulic diaphragms deform to enable a conveying medium to be sucked into a liquid suction valve to enter the hydraulic shells, and the conveying medium is pushed by the hydraulic diaphragms to be discharged through a liquid discharging valve; a hydraulic pumping structure is formed by the hydraulic shells symmetrically arranged outside the lef