The invention relates to a cutting device with high precision. The cutting device comprises a fixing box, a motor, a lifting mechanism, a clamping mechanism and detecting mechanisms, the clamping mechanism comprises a blade, a connecting assembly and clamping assemblies, and each detecting mechanism comprises a connecting plate, an abutting rod, a ball, a supporting rod, a second spring and a sliding block. According to the cutting device with high precision, elastic clamping of the blade is achieved through the clamping mechanism, positioning of the blade is achieved through positioning pins,the blade can rotate better, slipping of the blade is prevented, limiting of the center of the blade is achieved through positioning rods, the axis of the blade coincides with the axis of a motor rotating shaft all the time, the stability of the blade is improved, installation is convenient, the blade is detected through the detection mechanisms, the situation that the blade deforms after being used for a long time, and consequently the machining precision is affected is prevented, and the use practicability is improved.