The invention discloses a body measuring device for costume design, and relates to the field of clothing manufacture tools. The device comprises a stopping plate and a sliding rod which is vertically fixed to the stopping plate, the sliding rod is provided with scales from bottom to top, a sliding sleeve is arranged on the sliding rod in a sleeving mode, the sliding sleeve can slide up and down freely on the sliding rod, the sliding sleeve is provided with a cross rod, a flexible rule and a locking device, the cross rod is horizontally arranged on the sliding sleeve, the flexible rule is a flexible leather measuring tape capable of retracting automatically, the locking device comprises a support, an ejector head, a connecting rod, a spring and a push rod, a through hole perpendicular to the sliding rod is formed in the sliding sleeve, the support is arranged around the through hole, the ejector head is fixed to the bottom of the connecting rod, the top of the connecting rod is hinged to the bottom of the push rod, the middle of the push rod is fixed to the support through a rotating shaft in a crossed mode, and the connecting rod between a beam on the support and the ejector head is sleeved with the spring. The device is simple in structure, convenient to manufacture, easy to measure and capable of rapidly and accurately measuring important data of the whole body, and the work efficiency and clothing manufacture quality are greatly improved.