The invention relates to a pump, in particular to a novel magnetic gear pump used for conveying various chemical mediums, or oil, or water, or poisonous and harmful, or flammable and explosive liquid and having the advantages of corrosion resistance, acid and alkali resistance, high-temperature resistance, high-pressure resistance, magnetic driving, zero leakage and zero pulsation. The magnetic gear pump, provided by the invention, solves the defects in the prior art through innovation of design structure, improvement of processing technology and reasonable selection of metal and nonmetal combination materials, so that the pump can satisfy the working conditions of high temperature, high pressure and various viscosities, and can efficiently convey various demanding chemical mediums having the characteristics of poison, harm, easy volatilization, easy corrosion and easy crystallization; the magnetic driving is adopted to connect the driving of the pump and a motor, so that zero leakage and zero pulsation are truly realized, the difficulty of shaft seal leakage in the prior art is solved, the radial load caused by misalignment is eliminated, the overload protection effect is achieved, and the wide application to various industries as petroleum, chemical engineering, pharmacy, foods, tobaccos, papermaking and laboratories is achieved.