Two-positioning blocking device of a washing drum, comprising one position sensor (1) of a washing drum, one blocking disc (2) with at least two cut-out sections (2a, 2b) provided on its circumference and with more than one positioning strip (16), wherein the strip (16) is firmly connected to a rotary part of a component of the washing drum, one blocking element (4) intended to be inserted into one of the cut-out sections (2a, 2b) of the blocking disc (2), controlled by at least one actuating member, which is connected to a control system of a washing machine, whereas the blocking element (4) is controlled directly by the actuating member or via a scroll bar (6), and at least two controlling micro-switches (13, 15), which are intended to signalize a position of the blocking element (4) and are able to communicate with the control system of the washing machine.