The invention discloses an experimental rat holder which is a suspension or traveling support type experimental rat holder, comprising a base, a plug bush, a suspension rack, a traveling support, a rat holding rack, a drum type rat holding box, an operating
desk and a
tail pressing rack, characterized in that: the plug bush is fixed at the front part of the base, the suspension rack or the traveling support is inserted into the plug bush, the suspension rack or the traveling support fixes the rat holding rack or the drum type rat holding box, the operating
desk is fixed at the back part of the base, the
tail pressing rack is arranged on the operating
desk, lugs are fixed to the operating desk, two lugs are flexibly connected with one end of the
tail pressing rack through a small axis pin, a rubber pad is fixed at the tail pressing part of the tail pressing rack, an adjusting screw and a gravity nut are assembled on the tail pressing rack, and a
tempering heater is fixed to the operating desk provided with a moving platform. The experimental rat holder provided by the invention can enable the rattail
vein to dilate and keep in a horizontal straight line, thus facilitating
needle insertion and injection, reducing the difficulty in rattail intravenous injection, and enabling animal experiments to be performed smoothly.