Deflection performance detection device for bridge truss model

The utility model belongs to the field of bridge detection, and discloses a deflection performance detection device for a bridge truss model, which comprises a base frame, a bearing plate, a load vehicle, a travelling crane driving assembly and a distance measuring sensor, and is characterized in that the base frame comprises a pair of positioning sub-frames and a truss bearing sub-frame positioned between the positioning sub-frames; the truss bearing sub-frame is movably arranged in the vertical direction, the two ends of the bearing plate are arranged at the tops of the two positioning sub-frames correspondingly, and the load vehicle is arranged on the bearing plate; the traveling crane driving assembly is used for driving the load vehicle to move, the transmitting end of the distance measuring sensor vertically faces the truss bearing sub-frame, and when the traveling crane driving assembly drives the load vehicle to travel to the preset position laid on the preset bridge truss bearing plate, the distance