The invention discloses an oil production wellhead integrating device which is designed for achieving normal production of crude oil. A hydraulic cylinder six-way pipe is provided with an upper port, a lower port, a lateral lower port, a left port, a right port, a front port and a rear port. The ports are connected with pipeline flow paths, a ball feeding assembly, a chemical feeding assembly, a crank operating assembly, a pressure meter front mounting assembly and a pressure meter rear mounting assembly respectively. A two-cavity plunger which is internally provided with a sampling cavity and a working cavity is arranged in the hydraulic cylinder six-way pipe. The oil production wellhead integrating device integrates the functions of sampling, pressure relief, ball charging, chemical feeding, oil pressure measurement, blowing, backward flowing prevention and the like and has the advantages of preventing the crude oil from flowing backwards, reducing leakage risks, saving resources, protecting the environment, lowering investment and labor intensity and the like. The number of components capable of being dismantled manually is reduced, and the oil production wellhead integrating device is simple in structure, high in anti-dismantling capability and anti-damage capability and capable of guaranteeing airtight gathering and transportation of the crude oil and normal production of oil fields.