Opening valve type expansion packer

The utility model relates to an opening valve type expansion packer, which is mainly used for staged fracturing construction of a horizontal well of an oil-gas field, and comprises an upper joint, a control sleeve, a center pipe, an opening valve sleeve, an opening valve core, a check valve, a connector, a sealed rubber cylinder, a sealed joint, a lower joint, and the like, wherein the opening valve is combined with the check valve for use, so as to control the opening pressure of the packer within a range similar to a setting pressure, and effectively prevent the packer from being prematurely set during the well-descending process; the check vale enables the liquid to unidirectionally flow into the sealed rubber cylinder and prevent backflow; and at a later stage, when a pressure difference slide bushing is opened and the pressure fracture operation is performed, as the pressure suddenly increases, liquid can be continuously pumped into the sealed rubber cylinder through the check valve, thereby enabling the rubber cylinder to be sufficiently expanded and have better sealing performance. The opening valve type expansion packer has a simple structure and is convenient to operate.