A material rake mechanism arranged on a spiral material picking machine and used for loosening materials comprises a material rake, a hoisting mechanism, a four-wheel assembly, a two-wheel assembly, a material rake bracket, a gear-rack transmission device, a box beam, a rack, a driving device, a driving gear and a motor. The positions, at a bottom beam, of the material rake and the material rake bracket are hinged, the pitching angle of the upper portion of the material rake can be adjusted through the hoisting mechanism fixed to the material rake bracket which is of a statically determinate truss structure, and the material rake is driven to move back and forth by the gear-rack transmission device through the four-wheel assembly and the two-wheel assembly which are fixed to the material rake bracket so that material loosening work can be completed. The gear-rack transmission device serves as a transmission device of the material rake mechanism, and the rack is fixed to the side face of the box beam. The material rake mechanism is novel and simple in design thought, the steel structure is definite and reasonable in stress and low in weight, the gear and rack transmission mode is easy, the economical and reliable effect is achieved, the cost is reduced, and the material rake mechanism is applied to the technical fields of metallurgy, electric power, chemical industry, coal, papermaking, building materials and the like.