Precise coating scriber

A precise coating scriber comprises a base (2), a test piece platform (7) capable of being moved straightly is arranged on the base, a force bearing support (9) is arranged at one end of the base and divided into a first bearing section, a second bearing section and a third bearing section, a first pulley (12) is arranged on the first bearing section, a second pulley (11) is arranged on the second bearing section in a pivoted mode, and the middle of a force arm (16) is arranged on the third bearing section in a pivoted mode; a force arm balancer (17) is arranged at one end of the force arm, a tool bit (18) is arranged at the other end of the force arm, the end, away from the tool bit, of the force arm is fixedly connected with one end of a pull rope (10), and the pull rope winds around the second pulley and the first pulley in sequence and then is connected with a weight base in a hanging mode; a force arm state controller (27) is arranged below the second bearing section and enables the force arm to be in a shutdown state or a working state. According to the precise coating scriber, the value of force applied to a test piece by a blade can be precisely controlled, a coating can be effectively scribed in a penetrating through mode through the blade, linear scribing is guaranteed, and standard requirements for measurement are met.