The invention discloses a funnel with movable heating sleeves. The funnel comprises a funnel body and the heating sleeves. The funnel body comprises a horn-shaped funnel body and a diversion pipe arranged at the center of the lower end of the funnel body. The lower end of the funnel body is fixedly connected with a support frame. The support frame comprises three telescopic rods symmetrical with one another and reinforcing rods horizontally and fixedly connected between the adjacent telescopic rods. Cross rods are symmetrically arranged on the two sides of the outer wall of the funnel body. The lower ends of the cross rods are each provided with a sliding rail. A sliding block is slidably connected into each sliding rail. The lower end of each sliding block is symmetrically provided with the heating sleeves. An interlayer is arranged in each heating sleeve. Every two heating sleeves are slidably attached to form an outer interlayer enclosing the funnel body. A heating wire is arranged on the inner wall of the interlayer of each heating sleeve. Fine sand is laid in the interlayer of each heating sleeve. By means of the manner, the funnel can be controlled to be heated and insulated, and the situation that an experiment solution cools, solid crystals are separated out, and consequently the funnel is blocked is prevented.