In this work, spherical, flower and urchin like platinum nanoparticles (PtNSs, PtNFs, PtNUs) decorated ordered mesoporous carbon (OMC) architecture were synthesized through a facile strategy without any template, surfactant and stabilizer. The different morphologies can be controlled by simple adjusting the proportion of precursor K2PtCl4, HCOOH and OMC at room temperature, this both simplifies the synthesis procedure and permits good mixing, with better interfacing between the two nanophases of K2PtCl4 and OMC. The formation mechanism of PtNUs, PtIsiFs and PtNSs decorated OMC (OMC PtNUs, OMC PtNFs and OMC PtNSs) was deeply researched. The novel structure has the potential to possess high Pt utilization, high Pt activity surface and high specific surface area of OMC, which enables the excellent electrochemical sensing performance. Paracetamol (AP), methanol and glucose were employed as redox probes to study the electrocatalytic performance, which shows favorable electron transfer kinetics. The novel structure should be a good model for constructing a promising electrochemical sensing platform for further research in pharmaceutical preparations and in biological fluids.