A chassis platform module for an electric vehicle, comprising: a frame part having a battery module coupled thereto, and including a plurality of members assembled to each other; a first support part extending from one side of the frame part in a longitudinal direction thereof, having a front wheel chassis module mounted thereon, and including a connection member assembled to the frame part; a second support part extending from another side of the frame part in the longitudinal direction thereof, and having a rear wheel chassis module mounted thereon; and a connector part including a plurality of connector members (510,520,530) assembled between the plurality of members of the frame part or assembled to the frame part and the first support part so as to connect the plurality of members to the connection member, wherein the connection member and the plurality of members of the frame part include guide protrusions respectively configured to place the plurality of connector members (510,520,530) on surfaces of the connection member and the plurality of members, which are assembled to the plurality of connector members (510,520,530), such that the connector part is assembled at predetermined positions of the first support part and the frame part when assembled to the first support part and the frame part, characterized in that the frame part comprises: a battery cross member disposed on one side of the battery module in a longitudinal direction thereof, and connected to the first support part; a pair of battery side members disposed on both sides of the battery module in a widthwise direction thereof, and connected to the battery cross member; and a corner member connected to and extending diagonally between the battery cross member and each of the pair of battery side members. a frame part having a battery module coupled thereto, and including a plurality of members assembled to each other; a first support part extending from one side of the frame part in a longitudinal direction thereof, having a front wheel chassis module mounted thereon, and including a connection member assembled to the frame part; a second support part extending from another side of the frame part in the longitudinal direction thereof, and having a rear wheel chassis module mounted thereon; and a connector part including a plurality of connector members (510,520,530) assembled between the plurality of members of the frame part or assembled to the frame part and the first support part so as to connect the plurality of members to the connection member, wherein the connection member and the plurality of members of the frame part include guide protrusions respectively configured to place the plurality of connector members (510,520,530) on surfaces of the connection member and the plurality of members, which are assembled to the plurality of connector members (510,520,530), such that the connector part is assembled at predetermined positions of the first support part and the frame part when assembled to the first support part and the frame part, characterized in that the frame part comprises: a battery cross member disposed on one side of the battery module in a longitudinal direction thereof, and connected to the first support part; a pair of battery side members disposed on both sides of the battery module in a widthwise direction thereof, and connected to the battery cross member; and a corner member connected to and extending diagonally between the battery cross member and each of the pair of battery side members. a battery cross member disposed on one side of the battery module in a longitudinal direction thereof, and connected to the first support part; a pair of battery side members disposed on both sides of the battery module in a widthwise direction thereof, and connected to the battery cross member; and a corner member connected to and extending diagonally between the battery cross member and each of the pair of battery side members.