The utility model discloses a rabbit weight body length measuring device, including body measurer (1), it includes still that adjustable body length measures case (2), and the upper surface of body measurer (1) is for holding rabbit chassis (3), adjustable body length measure case (2) and constitute by first extension board (4), second extension board (5), fixed plate (6) and loose axle (7), the top of first extension board (4) and second extension board (5) all is provided with draw runner (12), the upper surface of draw runner (12) is provided with scale mark (8), is provided with spout (9) on the inner wall of draw runner (12), the both sides of loose axle (7) are provided with and slider (10) of spout (9) matching. The beneficial effects of the utility model are that: both satisfy the requirement of rabbit weight measuring, satisfied the requirement of rabbit body length measuring again, realize the body length and measured the case and can adjust, satisfied the measurement demand of different body size rabbit, improved measurement of efficiency.