The invention discloses a support platform for a land gravimeter. The support platform comprises a base, the bottom of the base is supported through supporting legs, four corners of the base are respectively provided with an installing hole connected with the supporting legs, the number of the supporting legs is four, the two adjacent supporting legs are first supporting legs, the remaining supporting legs are second supporting legs, the first supporting legs are vertical to a horizontal plane and are parallel to each other, the second supporting legs are fixed in an outward inclination manner, each first supporting leg comprises a supporting leg housing, an elevating device is arranged in the supporting leg housing, the elevating device is controlled through a coarse-tuning nut arranged on the supporting leg housing, the top of the elevating device is connected with the bottom of the base through a fine-tuning member, the second supporting legs are connected with the bottom of the base through the fine-tuning members, and the tops of the fine-tuning members cooperate with the installing holes through support rods. According to the support platform, during supporting of the gravimeter, the gravimeter can be rapidly adjusted to the horizontal state, the stability of the gravimeter can be maintained, and the measuring precision is improved.