Multifunctional hydraulic anchorage draining apparatus

The utility model relates to a downhole tool used for oil well operations in oil fields, in particular to a multi-functional hydraulic anchoring oil drain device which comprises a top joint, an oil drain pin, an oil drain pipe, a limit ring, anchor teeth, a long pressure plate, a short pressure plate, a sunk screw, a preloaded spring and an anchor bottom joint which are connected in sequence. The top joint is connected with the oil drain pipe; the lower part of the oil drain pipe is mounted in the upper part of the anchor bottom joint and connected by through negative threads; the limit ring is connected with the highest top of the anchor bottom joint through threads; the upper part of the anchor bottom joint is evenly distributed with two oil drain holes, while the lower part is evenly distributed with six through holes; the anchor teeth are arranged in the six through holes, wherein each anchor tooth is provided with two preloaded springs which are pressed tightly; the upper ends of the preloaded springs ar