The invention provides a variable-trunk multi-legged walking platform. The variable-trunk multi-legged walking platform is composed of a front leg mechanism (A), a rear leg mechanism (B), a left trunk(C) and a right trunk (D), wherein the front leg mechanism (A) and the rear leg mechanism (B) are the same, and the left trunk (C) and the right trunk (D) are the same. The front leg mechanism (A), the rear leg mechanism (B), the left trunk (C) and the right trunk (D) are arranged anticlockwise according to the sequence of the front leg mechanism (A), the left trunk (C), the rear leg mechanism (B) and the right trunk (D), and adjacent parts are rotatably connected to form a closed single loop. The same front leg mechanism (A) and rear leg mechanism (B) of the variable-trunk multi-legged walking platform are both closed-chain connecting rod mechanisms, and are driven by a single motor to travel. By setting shape parameters of the front leg mechanism (A), the rear leg mechanism (B), the left trunk (C) and the right trunk (D), the variable-trunk multi-legged walking platform obtains the transformation ability of two modes. The degree of freedom of trunk transformation is added in a single-degree-of-freedom leg mechanism walking platform, terrain adaptability is improved, and the application occasions of the walking platform are enriched.