A detection apparatus for measuring an aperture quickly, comprising a working platform (1). The upper end face of the working platform (1) is provided with a profiling positioning block (2), a clamping fixture (3) and a plurality of aperture detection units (6). Each of the aperture detection units (6) comprises a sliding base (60) mounted on the working platform (1), a measuring sliding block (61) sliding up and down along the sliding base (60), at least one probe (62) arranged on the measuring sliding block (61) and capable of expanding up and down, and a probe sensor (63) arranged below the probe (62). Each probe sensor (63) is in communication with a corresponding red LED indicator lamp in the middle portion of the working platform (1) through a wire. The apparatus reduces a part detection time, reduces a quality judgement waiting time, increases device outputs and improves the utilization rate; by changing a manual detection mode, the labor intensity of employees is reduced, the quality of the produced parts can be ensured more stably and the detection operation efficiency is greatly improved; and enterprise competitiveness can be improved, while quality detection costs are reduced, without requiring the investment of more funds.