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This utility model relates to downhole release devices and belongs to the field of downhole tool technology. The purpose of this utility model is to address the problems existing in the prior art by providing a downhole release device, including an upper connector, with a casing female thread and a trapezoidal thread male thread at both ends; and a lower connector, with a trapezoidal thread female thread and a casing male thread at both ends; the ends of the trapezoidal thread male and female threads are tapered. The upper and lower connectors of this utility model are connected by trapezoidal threads at the tapered ends; after connection, an effective seal is formed, isolating internal and external mud. Even under high pump pressure circulation, the tapered trapezoidal threads will not be eroded by mud and can withstand various complex stresses (but not torque) together with the tubing string.