The invention relates to a device for measuring a plum blossom petal-shaped inner chamber, which comprises a measuring head, spray nozzles, a measuring seat, a base and gas circuit joints; air outlet holes are arranged at the upper part, the lower part and in the position of the axial center of each petal-shaped rib; the air outlet holes at the upper parts and the lower parts of the petal-shaped ribs are on the same circumference respectively, and two air outlet holes which are opposite to each other in the axial direction are communicated with each other as a group; the measuring spray nozzles are pressed into the air outlet holes; the lower end of the measuring head is fixed on the measuring seat; a plurality of gas circuit joints are mounted at the bottom part of the measuring seat; and a plurality of groups of gas circuit which are communicated with each other are arranged inside and separately connected with a float type pneumatic micrometer, so that the purpose of simultaneously measuring a plurality of parameters of plum blossom heterotype inner holes can be achieved. The invention can improve the detection efficiency, and meanwhile avoids the occurrence of product rejection due to misjudgement, and has the advantages of convenient operation and greatly reduced labor intensity.