The invention discloses a physical mechanics dynamometer comprising an upper clamping board, rotation apparatuses are fixedly connected on a left side face and a right side face of the upper clampingboard, top ends of the two rotation apparatuses are respectively fixedly connected to a first driven wheel and a second driven wheel, and the first driven wheel and the second driven wheel are respectively positioned on a left side and a right side of the upper clamping board. In the physical mechanics dynamometer, the upper clamping board, a lower clamping board, a first driving wheel, a second driving wheel, a screw thread column, a screw thread cap, a first clamping groove and a second clamping groove are arranged; when use of a dynamometer body is required, the upper clamping board is placed on a clamping block by a teacher, the clamping block is clamped via the first clamping groove, the lower clamping board is enabled to drive the second clamping groove to move upward so as to clampthe clamping block, the dynamometer body is fixed and cannot shake leftward or rightward, the dynamometer body can be prevented from shaking leftward or rightward due to effects exerted by heavy objects when the heavy objects are hung on a hook, and inaccuracy of numeric values on the dynamometer body can be prevented.