Well testing instrument catcher

The invention discloses a well testing instrument catcher which comprises a body, a rotary sleeve and clamping blocks. The body is a cylinder, the diameters of the two ends of the body are small, theouter diameter of the middle large cylinder is large, external threads are arranged at the upper end, and a circular truncated cone is arranged at the lower ends of the external threads; the large cylinder is provided with a plurality of liquid discharge holes and a flat square; oblong hole grooves matched with the clamping blocks are formed in the circumference of the lower portion of the body, square holes are formed in the middles of the oblong hole grooves, big-end-up round holes are formed in the upper ends and the lower ends of the square holes respectively, and clamping block return springs are placed on upper holes in steps, and internal threads are arranged in lower holes. The well testing instrument catcher is simple in structure, reasonable in design and capable of successfullycapturing a downhole instr