Compact five-dimensional attitude adjustment platform suitable for optical performance detection of small-caliber optical element

The invention discloses a compact five-dimensional posture adjusting platform suitable for optical performance detection of a small-caliber optical element. The compact five-dimensional posture adjusting platform comprises an L-shaped base, a lifting adjusting assembly, a pitching adjusting assembly, a deflection adjusting assembly, an X-axis displacement adjusting assembly, a Y-axis displacement adjusting assembly and an L-shaped bracket. The lifting adjusting assembly and the pitching adjusting assembly are arranged on a vertical plate of the L-shaped bracket, and the lifting adjusting assembly is further connected with a vertical plate of the L-shaped base. The deflection adjusting assembly, the X-axis displacement adjusting assembly and the Y-axis displacement adjusting assembly are sequentially stacked on a horizontal plate of the L-shaped bracket from top to bottom. The height, pitching, deflection, transverse position and longitudinal position of an instrument or a tested element can be adjusted, so th