Backsaw aid

The utility model relates to an auxiliary sawing apparatus for a manual saw, comprising a base body whose bottom is pivoted with a long frame body. Both ends of the base body extend into a circular shaft sleeve. The top end of the radial concave part of the shaft sleeve forms an opening. A fixed seat is a C-shaped sleeve ring which is sheathed at the outer diameter of the shaft sleeve. The inner diameter of the C-shaped sleeve ring is corresponding to the outer diameter of the shaft sleeve. The shaft centers of the C-shaped sleeve ring and the shaft sleeve and the sawing bottom line of a manual saw form a straight line. The top is fixedly provided with two sliding rods, and the manual saw can be positioned and sheathed on the two sliding rods. Both sides of the circumference of the outer diameter of the fixed seat are pivoted with at least one group of positioning pins. The concave part of the outer diameter of the shaft sleeve corresponding to the axial direction of the positioning pins is provided with an annular guide groove which extends along the circumference of the outer diameter of the shaft sleeve. The positioning pins can be tensioned, can be adjusted and can be limited along the axial direction. Various operations along longitudinal oblique cutting angles can be conveniently carried out.